Auditory Threshold: The audibility limit of discriminating sound intensity and pitch.Audiometry: The testing of the acuity of the sense of hearing to determine the thresholds of the lowest intensity levels at which an individual can hear a set of tones. The frequencies between 125 and 8000 Hz are used to test air conduction thresholds and the frequencies between 250 and 4000 Hz are used to test bone conduction thresholds.Audiometry, Pure-Tone: Measurement of hearing based on the use of pure tones of various frequencies and intensities as auditory stimuli.Cochlear Diseases: Pathological processes of the snail-like structure (COCHLEA) of the inner ear (LABYRINTH) which can involve its nervous tissue, blood vessels, or fluid (ENDOLYMPH).Hearing Loss, Noise-Induced: Hearing loss due to exposure to explosive loud noise or chronic exposure to sound level greater than 85 dB. The hearing loss is often in the frequency range 4000-6000 hertz.Hearing: The ability or act of sensing and transducing ACOUSTIC STIMULATION to the CENTRAL NERVOUS SYSTEM. It is also called audition.Evoked Potentials, Auditory, Brain Stem: Electrical waves in the CEREBRAL CORTEX generated by BRAIN STEM structures in response to auditory click stimuli. These are found to be abnormal in many patients with CEREBELLOPONTINE ANGLE lesions, MULTIPLE SCLEROSIS, or other DEMYELINATING DISEASES.Melopsittacus: A genus, commonly called budgerigars, in the family PSITTACIDAE. In the United States they are considered one of the five species of PARAKEETS.Cochlea: The part of the inner ear (LABYRINTH) that is concerned with hearing. It forms the anterior part of the labyrinth, as a snail-like structure that is situated almost horizontally anterior to the VESTIBULAR LABYRINTH.Noise: Any sound which is unwanted or interferes with HEARING other sounds.Hearing Loss: A general term for the complete or partial loss of the ability to hear from one or both ears.Acoustic Stimulation: Use of sound to elicit a response in the nervous system.Sensory Thresholds: The minimum amount of stimulus energy necessary to elicit a sensory response.Differential Threshold: The smallest difference which can be discriminated between two stimuli or one which is barely above the threshold.Pain Threshold: Amount of stimulation required before the sensation of pain is experienced.Ketamine: A cyclohexanone derivative used for induction of anesthesia. Its mechanism of action is not well understood, but ketamine can block NMDA receptors (RECEPTORS, N-METHYL-D-ASPARTATE) and may interact with sigma receptors.Anesthetics, Dissociative: Intravenous anesthetics that induce a state of sedation, immobility, amnesia, and marked analgesia. Subjects may experience a strong feeling of dissociation from the environment. The condition produced is similar to NEUROLEPTANALGESIA, but is brought about by the administration of a single drug. (From Gilman et al., Goodman and Gilman's The Pharmacological Basis of Therapeutics, 8th ed)Isoflurane: A stable, non-explosive inhalation anesthetic, relatively free from significant side effects.Chinchilla: A genus of the family Chinchillidae which consists of three species: C. brevicaudata, C. lanigera, and C. villidera. They are used extensively in biomedical research.Noise, Occupational: Noise present in occupational, industrial, and factory situations.Ear Protective Devices: Personal devices for protection of the ears from loud or high intensity noise, water, or cold. These include earmuffs and earplugs.Felidae: The cat family in the order CARNIVORA comprised of muscular, deep-chested terrestrial carnivores with a highly predatory lifestyle.Panthera: Genus in the family FELIDAE comprised of big felines including LIONS; TIGERS; jaguars; and the leopard.Lynx: A genus in the family FELIDAE comprising felines with long legs, ear tufts, and a short tail.Acinonyx: A genus of long-legged, swift-moving felines (FELIDAE) from Africa (and formerly Asia) about the size of a small leopard.Felis: Genus in the family FELIDAE comprised of small felines including the domestic cat, Felis catus (CATS) and its ancestor the wild cat, Felis silvestris.Thioctic Acid: An octanoic acid bridged with two sulfurs so that it is sometimes also called a pentanoic acid in some naming schemes. It is biosynthesized by cleavage of LINOLEIC ACID and is a coenzyme of oxoglutarate dehydrogenase (KETOGLUTARATE DEHYDROGENASE COMPLEX). It is used in DIETARY SUPPLEMENTS.San FranciscoTime and Motion Studies: The observation and analysis of movements in a task with an emphasis on the amount of time required to perform the task.Biological Science Disciplines: All of the divisions of the natural sciences dealing with the various aspects of the phenomena of life and vital processes. The concept includes anatomy and physiology, biochemistry and biophysics, and the biology of animals, plants, and microorganisms. It should be differentiated from BIOLOGY, one of its subdivisions, concerned specifically with the origin and life processes of living organisms.Audiovisual Aids: Auditory and visual instructional materials.Emotions: Those affective states which can be experienced and have arousing and motivational properties.Smell: The ability to detect scents or odors, such as the function of OLFACTORY RECEPTOR NEURONS.Nose Diseases: Disorders of the nose, general or unspecified.Receptor, Parathyroid Hormone, Type 2: A parathyroid hormone receptor subtype found in the BRAIN and the PANCREAS. It is a G-protein-coupled receptor with a ligand specificity that varies between homologs from different species.Ethmoid Bone: A light and spongy (pneumatized) bone that lies between the orbital part of FRONTAL BONE and the anterior of SPHENOID BONE. Ethmoid bone separates the ORBIT from the ETHMOID SINUS. It consists of a horizontal plate, a perpendicular plate, and two lateral labyrinths.Olfaction Disorders: Loss of or impaired ability to smell. This may be caused by OLFACTORY NERVE DISEASES; PARANASAL SINUS DISEASES; viral RESPIRATORY TRACT INFECTIONS; CRANIOCEREBRAL TRAUMA; SMOKING; and other conditions.World War I: Global conflict primarily fought on European continent, that occurred between 1914 and 1918.Famous PersonsPeriodicals as Topic: A publication issued at stated, more or less regular, intervals.VermontNew HampshireStapes Surgery: Surgery performed in which part of the STAPES, a bone in the middle ear, is removed and a prosthesis is placed to help transmit sound between the middle ear and inner ear.Otosclerosis: Formation of spongy bone in the labyrinth capsule which can progress toward the STAPES (stapedial fixation) or anteriorly toward the COCHLEA leading to conductive, sensorineural, or mixed HEARING LOSS. Several genes are associated with familial otosclerosis with varied clinical signs.Stapes: One of the three ossicles of the middle ear. It transmits sound vibrations from the INCUS to the internal ear (Ear, Internal see LABYRINTH).Tympanoplasty: Surgical reconstruction of the hearing mechanism of the middle ear, with restoration of the drum membrane to protect the round window from sound pressure, and establishment of ossicular continuity between the tympanic membrane and the oval window. (Dorland, 28th ed.)Canrenone: A synthetic pregnadiene compound with anti-aldosterone activity.Sound Localization: Ability to determine the specific location of a sound source.Reproducibility of Results: The statistical reproducibility of measurements (often in a clinical context), including the testing of instrumentation or techniques to obtain reproducible results. The concept includes reproducibility of physiological measurements, which may be used to develop rules to assess probability or prognosis, or response to a stimulus; reproducibility of occurrence of a condition; and reproducibility of experimental results.Sound: A type of non-ionizing radiation in which energy is transmitted through solid, liquid, or gas as compression waves. Sound (acoustic or sonic) radiation with frequencies above the audible range is classified as ultrasonic. Sound radiation below the audible range is classified as infrasonic.Magnetoencephalography: The measurement of magnetic fields over the head generated by electric currents in the brain. As in any electrical conductor, electric fields in the brain are accompanied by orthogonal magnetic fields. The measurement of these fields provides information about the localization of brain activity which is complementary to that provided by ELECTROENCEPHALOGRAPHY. Magnetoencephalography may be used alone or together with electroencephalography, for measurement of spontaneous or evoked activity, and for research or clinical purposes.Electroencephalography: Recording of electric currents developed in the brain by means of electrodes applied to the scalp, to the surface of the brain, or placed within the substance of the brain.Hearing Loss, Sensorineural: Hearing loss resulting from damage to the COCHLEA and the sensorineural elements which lie internally beyond the oval and round windows. These elements include the AUDITORY NERVE and its connections in the BRAINSTEM.Deafness: A general term for the complete loss of the ability to hear from both ears.Education, Veterinary: Use for general articles concerning veterinary medical education.Ferrets: Semidomesticated variety of European polecat much used for hunting RODENTS and/or RABBITS and as a laboratory animal. It is in the subfamily Mustelinae, family MUSTELIDAE.Burning Mouth Syndrome: A group of painful oral symptoms associated with a burning or similar sensation. There is usually a significant organic component with a degree of functional overlay; it is not limited to the psychophysiologic group of disorders.Knee Joint: A synovial hinge connection formed between the bones of the FEMUR; TIBIA; and PATELLA.Knee: A region of the lower extremity immediately surrounding and including the KNEE JOINT.Osteoarthritis, Knee: Noninflammatory degenerative disease of the knee joint consisting of three large categories: conditions that block normal synchronous movement, conditions that produce abnormal pathways of motion, and conditions that cause stress concentration resulting in changes to articular cartilage. (Crenshaw, Campbell's Operative Orthopaedics, 8th ed, p2019)Pruritus Vulvae: Intense itching of the external female genitals.Ear, Inner: The essential part of the hearing organ consists of two labyrinthine compartments: the bony labyrinthine and the membranous labyrinth. The bony labyrinth is a complex of three interconnecting cavities or spaces (COCHLEA; VESTIBULAR LABYRINTH; and SEMICIRCULAR CANALS) in the TEMPORAL BONE. Within the bony labyrinth lies the membranous labyrinth which is a complex of sacs and tubules (COCHLEAR DUCT; SACCULE AND UTRICLE; and SEMICIRCULAR DUCTS) forming a continuous space enclosed by EPITHELIUM and connective tissue. These spaces are filled with LABYRINTHINE FLUIDS of various compositions.Ear: The hearing and equilibrium system of the body. It consists of three parts: the EXTERNAL EAR, the MIDDLE EAR, and the INNER EAR. Sound waves are transmitted through this organ where vibration is transduced to nerve signals that pass through the ACOUSTIC NERVE to the CENTRAL NERVOUS SYSTEM. The inner ear also contains the vestibular organ that maintains equilibrium by transducing signals to the VESTIBULAR NERVE.Auditory Pathways: NEURAL PATHWAYS and connections within the CENTRAL NERVOUS SYSTEM, beginning at the hair cells of the ORGAN OF CORTI, continuing along the eighth cranial nerve, and terminating at the AUDITORY CORTEX.Wind: The motion of air relative to the earth's surface.Energy-Generating Resources: Materials or phenomena which can provide energy directly or via conversion.Power Plants: Units that convert some other form of energy into electrical energy.Professional Corporations: Legally authorized corporations owned and managed by one or more professionals (medical, dental, legal) in which the income is ascribed primarily to the professional activities of the owners or stockholders.Radar: A system using beamed and reflected radio signals to and from an object in such a way that range, bearing, and other characteristics of the object may be determined.Fluoridation: Practice of adding fluoride to water for the purpose of preventing tooth decay and cavities.Aviation: Design, development, manufacture, and operation of heavier-than-air AIRCRAFT.Hypothyroidism: A syndrome that results from abnormally low secretion of THYROID HORMONES from the THYROID GLAND, leading to a decrease in BASAL METABOLIC RATE. In its most severe form, there is accumulation of MUCOPOLYSACCHARIDES in the SKIN and EDEMA, known as MYXEDEMA.Accidents, AviationWater Supply: Means or process of supplying water (as for a community) usually including reservoirs, tunnels, and pipelines and often the watershed from which the water is ultimately drawn. (Webster, 3d ed)Speech Perception: The process whereby an utterance is decoded into a representation in terms of linguistic units (sequences of phonetic segments which combine to form lexical and grammatical morphemes).Hyperbilirubinemia: A condition characterized by an abnormal increase of BILIRUBIN in the blood, which may result in JAUNDICE. Bilirubin, a breakdown product of HEME, is normally excreted in the BILE or further catabolized before excretion in the urine.Rats, Gunn: Mutant strain of Rattus norvegicus which is used as a disease model of kernicterus.Presynaptic Terminals: The distal terminations of axons which are specialized for the release of neurotransmitters. Also included are varicosities along the course of axons which have similar specializations and also release transmitters. Presynaptic terminals in both the central and peripheral nervous systems are included.Bilirubin: A bile pigment that is a degradation product of HEME.Synaptic Transmission: The communication from a NEURON to a target (neuron, muscle, or secretory cell) across a SYNAPSE. In chemical synaptic transmission, the presynaptic neuron releases a NEUROTRANSMITTER that diffuses across the synaptic cleft and binds to specific synaptic receptors, activating them. The activated receptors modulate specific ion channels and/or second-messenger systems in the postsynaptic cell. In electrical synaptic transmission, electrical signals are communicated as an ionic current flow across ELECTRICAL SYNAPSES.Sleep: A readily reversible suspension of sensorimotor interaction with the environment, usually associated with recumbency and immobility.Lunch: The meal taken at midday.Sleep Stages: Periods of sleep manifested by changes in EEG activity and certain behavioral correlates; includes Stage 1: sleep onset, drowsy sleep; Stage 2: light sleep; Stages 3 and 4: delta sleep, light sleep, deep sleep, telencephalic sleep.Baroreflex: A response by the BARORECEPTORS to increased BLOOD PRESSURE. Increased pressure stretches BLOOD VESSELS which activates the baroreceptors in the vessel walls. The net response of the CENTRAL NERVOUS SYSTEM is a reduction of central sympathetic outflow. This reduces blood pressure both by decreasing peripheral VASCULAR RESISTANCE and by lowering CARDIAC OUTPUT. Because the baroreceptors are tonically active, the baroreflex can compensate rapidly for both increases and decreases in blood pressure.Sleep, REM: A stage of sleep characterized by rapid movements of the eye and low voltage fast pattern EEG. It is usually associated with dreaming.KansasElectric Stimulation: Use of electric potential or currents to elicit biological responses.Cochlear Nerve: The cochlear part of the 8th cranial nerve (VESTIBULOCOCHLEAR NERVE). The cochlear nerve fibers originate from neurons of the SPIRAL GANGLION and project peripherally to cochlear hair cells and centrally to the cochlear nuclei (COCHLEAR NUCLEUS) of the BRAIN STEM. They mediate the sense of hearing.Benzothiadiazines: Heterocyclic compounds of a ring with SULFUR and two NITROGEN atoms fused to a BENZENE ring. Members inhibit SODIUM-POTASSIUM-CHLORIDE SYMPORTERS and are used as DIURETICS.Receptors, AMPA: A class of ionotropic glutamate receptors characterized by their affinity for the agonist AMPA (alpha-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid).Synapses: Specialized junctions at which a neuron communicates with a target cell. At classical synapses, a neuron's presynaptic terminal releases a chemical transmitter stored in synaptic vesicles which diffuses across a narrow synaptic cleft and activates receptors on the postsynaptic membrane of the target cell. The target may be a dendrite, cell body, or axon of another neuron, or a specialized region of a muscle or secretory cell. Neurons may also communicate via direct electrical coupling with ELECTRICAL SYNAPSES. Several other non-synaptic chemical or electric signal transmitting processes occur via extracellular mediated interactions.Blogging: Using an INTERNET based personal journal which may consist of reflections, comments, and often hyperlinks.United StatesEar Canal: The narrow passage way that conducts the sound collected by the EAR AURICLE to the TYMPANIC MEMBRANE.Psychoacoustics: The science pertaining to the interrelationship of psychologic phenomena and the individual's response to the physical properties of sound.Otitis Externa: Inflammation of the OUTER EAR including the external EAR CANAL, cartilages of the auricle (EAR CARTILAGE), and the TYMPANIC MEMBRANE.Ear, External: The outer part of the hearing system of the body. It includes the shell-like EAR AURICLE which collects sound, and the EXTERNAL EAR CANAL, the TYMPANIC MEMBRANE, and the EXTERNAL EAR CARTILAGES.Auditory Cortex: The region of the cerebral cortex that receives the auditory radiation from the MEDIAL GENICULATE BODY.Auditory Fatigue: Loss of sensitivity to sounds as a result of auditory stimulation, manifesting as a temporary shift in auditory threshold. The temporary threshold shift, TTS, is expressed in decibels.Hair Cells, Auditory, Outer: Sensory cells of organ of Corti. In mammals, they are usually arranged in three or four rows, and away from the core of spongy bone (the modiolus), lateral to the INNER AUDITORY HAIR CELLS and other supporting structures. Their cell bodies and STEREOCILIA increase in length from the cochlear base toward the apex and laterally across the rows, allowing differential responses to various frequencies of sound.Hair Cells, Auditory: Sensory cells in the organ of Corti, characterized by their apical stereocilia (hair-like projections). The inner and outer hair cells, as defined by their proximity to the core of spongy bone (the modiolus), change morphologically along the COCHLEA. Towards the cochlear apex, the length of hair cell bodies and their apical STEREOCILIA increase, allowing differential responses to various frequencies of sound.Protein Interaction Mapping: Methods for determining interaction between PROTEINS.RNA, Messenger: RNA sequences that serve as templates for protein synthesis. Bacterial mRNAs are generally primary transcripts in that they do not require post-transcriptional processing. Eukaryotic mRNA is synthesized in the nucleus and must be exported to the cytoplasm for translation. Most eukaryotic mRNAs have a sequence of polyadenylic acid at the 3' end, referred to as the poly(A) tail. The function of this tail is not known for certain, but it may play a role in the export of mature mRNA from the nucleus as well as in helping stabilize some mRNA molecules by retarding their degradation in the cytoplasm.

Sensory perception: supernormal hearing in the blind? (1/1506)

A recent experimental study suggests that blind individuals may compensate for their lack of vision with better-than-normal hearing. This provides support for a view dating back to 18th century philosophers, but the data raise as many problems as they solve.  (+info)

Gene disruption of p27(Kip1) allows cell proliferation in the postnatal and adult organ of corti. (2/1506)

Hearing loss is most often the result of hair-cell degeneration due to genetic abnormalities or ototoxic and traumatic insults. In the postembryonic and adult mammalian auditory sensory epithelium, the organ of Corti, no hair-cell regeneration has ever been observed. However, nonmammalian hair-cell epithelia are capable of regenerating sensory hair cells as a consequence of nonsensory supporting-cell proliferation. The supporting cells of the organ of Corti are highly specialized, terminally differentiated cell types that apparently are incapable of proliferation. At the molecular level terminally differentiated cells have been shown to express high levels of cell-cycle inhibitors, in particular, cyclin-dependent kinase inhibitors [Parker, S. B., et al. (1995) Science 267, 1024-1027], which are thought to be responsible for preventing these cells from reentering the cell cycle. Here we report that the cyclin-dependent kinase inhibitor p27(Kip1) is selectively expressed in the supporting-cell population of the organ of Corti. Effects of p27(Kip1)-gene disruption include ongoing cell proliferation in postnatal and adult mouse organ of Corti at time points well after mitosis normally has ceased during embryonic development. This suggests that release from p27(Kip1)-induced cell-cycle arrest is sufficient to allow supporting-cell proliferation to occur. This finding may provide an important pathway for inducing hair-cell regeneration in the mammalian hearing organ.  (+info)

Assessment of hearing in 80 inbred strains of mice by ABR threshold analyses. (3/1506)

The common occurrence of hearing loss in both humans and mice, and the anatomical and functional similarities of their inner ears, attest to the potential of mice being used as models to study inherited hearing loss. A large-scale, auditory screening project is being undertaken at The Jackson Laboratory (TJL) to identify mice with inherited hearing disorders. To assess hearing sensitivity, at least five mice from each inbred strain had auditory brainstem response (ABR) thresholds determined. Thus far, we have screened 80 inbred strains of mice; 60 of them exhibited homogeneous ABR threshold values not significantly different from those of the control strain CBA/CaJ. This large database establishes a reliable reference for normal hearing mouse strains. The following 16 inbred strains exhibited significantly elevated ABR thresholds before the age of 3 months: 129/J, 129/ReJ, 129/SvJ, A/J, ALR/LtJ, ALS/LtJ, BUB/BnJ, C57BLKS/J, C57BR/cdJ, C57L/J, DBA/2J, I/LnJ, MA/MyJ, NOD/LtJ, NOR/LtJ, and SKH2/J. These hearing impaired strains may serve as models for some forms of human non-syndromic hearing loss and aid in the identification of the underlying genes.  (+info)

Inner ear damage in guinea pigs exposed to stable and impulse noise. (4/1506)

OBJECTIVE: To investigate the inner ear damage after exposure to stable noise, impulse noise and stable plus impulse noise in guinea pigs. METHODS: Ninety-six healthy guinea pigs were divided into 3 equal groups. (1) Stable noise group: exposed to 110 dBA stable noise for 3 days, 4 hours per day. (2) Impulse noise group: exposed to 165 dBA simulated cannon fire impulse noise 10 times successively at an interval of 10 seconds. (3) stable plus impulse noise group: exposed to the same stable noise as that in the first group, then after a 2-hour rest, the animals were followed with impulse noise exposures as that in the second group. After those exposure, each of the 3 groups was further divided into 4 subgroups according to the time after the noise exposure, namely, the right after, 7 d, 14 d and 30 d groups. The evoked cortical potential responses to click and tone burst stimulation sound were examined. The surface preparation and celloidine embedded serial section of the cochlea were observed under a light microscope. RESULTS: Both the stable and impulse noise could increase the hearing threshold and damage the inner ear hair cells. The damage in the first group was relatively slight, whereas in group 3 the damage was more severe than that in the other 2 groups. CONCLUSION: For seamen who are working in heavy noise environment, corresponding measures should be taken to protect their ears from noise which induces hearing loss.  (+info)

Single-unit responses in the inferior colliculus of decerebrate cats. I. Classification based on frequency response maps. (5/1506)

This study proposes a classification system for neurons in the central nucleus of the inferior colliculus (ICC) that is based on excitation and inhibition patterns of single-unit responses in decerebrate cats. The decerebrate preparation allowed extensive characterization of physiological response types without the confounding effects of anesthesia. The tone-driven discharge rates of individual units were measured across a range of frequencies and levels to map excitatory and inhibitory response areas for contralateral monaural stimulation. The resulting frequency response maps can be grouped into the following three populations: type V maps exhibit a wide V-shaped excitatory area and no inhibition; type I maps show a more restricted I-shaped region of excitation that is flanked by inhibition at lower and higher frequencies; and type O maps display an O-shaped island of excitation at low stimulus levels that is bounded by inhibition at higher levels. Units that produce a type V map typically have a low best frequency (BF: the most sensitive frequency), a low rate of spontaneous activity, and monotonic rate-level functions for both BF tones and broadband noise. Type I and type O units have BFs that span the cat's range of audible frequencies and high rates of spontaneous activity. Like type V units, type I units are excited by BF tones and noise at all levels, but their rate-level functions may become nonmonotonic at high levels. Type O units are inhibited by BF tones and noise at high levels. The existence of distinct response types is consistent with a conceptual model in which the unit types receive dominant inputs from different sources and shows that these functionally segregated pathways are specialized to play complementary roles in the processing of auditory information.  (+info)

Single-unit responses in the inferior colliculus of decerebrate cats. II. Sensitivity to interaural level differences. (6/1506)

Single units in the central nucleus of the inferior colliculus (ICC) of unanesthetized decerebrate cats can be grouped into three distinct types (V, I, and O) according to the patterns of excitation and inhibition revealed in contralateral frequency response maps. This study extends the description of these response types by assessing their ipsilateral and binaural response map properties. Here the nature of ipsilateral inputs is evaluated directly using frequency response maps and compared with results obtained from methods that rely on sensitivity to interaural level differences (ILDs). In general, there is a one-to-one correspondence between observed ipsilateral input characteristics and those inferred from ILD manipulations. Type V units receive ipsilateral excitation and show binaural facilitation (EE properties); type I and type O units receive ipsilateral inhibition and show binaural excitatory/inhibitory (EI) interactions. Analyses of binaural frequency response maps show that these ILD effects extend over the entire receptive field of ICC units. Thus the range of frequencies that elicits excitation from type V units is expanded with increasing levels of ipsilateral stimulation, whereas the excitatory bandwidth of type I and O units decreases under the same binaural conditions. For the majority of ICC units, application of bicuculline, an antagonist for GABAA-mediated inhibition, does not alter the basic effects of binaural stimulation; rather, it primarily increases spontaneous and maximum discharge rates. These results support our previous interpretations of the putative dominant inputs to ICC response types and have important implications for midbrain processing of competing free-field sounds that reach the listener with different directional signatures.  (+info)

A problem with auditory processing? (7/1506)

Recent studies have found associations between auditory processing deficits and language disorders such as dyslexia; but whether the former cause the latter, or simply co-occur with them, is still an open question.  (+info)

Frequency selective effects of alcohol on auditory detection and frequency discrimination thresholds. (8/1506)

In the first of two experiments, the effects of ethyl alcohol on monaural and binaural thresholds for pure tones were measured for a range of frequencies. The results showed a frequency-specific effect in which low frequencies were more severely affected than higher ones. Also, monaural thresholds tended to be more affected by alcohol than binaural ones. The second experiment extended this exploration by measuring frequency discrimination at several different frequencies. In this case, we also obtained a frequency-dependent effect: the increase in discrimination thresholds above 1000 Hz was three times greater than that for lower frequencies. The data suggest that the choice of stimuli may influence the ability to detect changes in auditory performance after alcohol and may account in part for the differences among earlier studies. The results are consistent with the hypothesis that alcohol is acting centrally, at the level of mechanisms involved in the temporal and binaural summation of auditory signals, rather than influencing peripheral structures.  (+info)

*Absolute threshold of hearing

This is also known as the auditory threshold. The threshold of hearing is generally reported as the RMS sound pressure of 20 ... Auditory sensitivity changes when the duration of a sound becomes less than 1 second. The threshold intensity decreases by ... The absolute threshold relates to the sound that can just be heard by the organism. The absolute threshold is not a discrete ... Measurement of the absolute hearing threshold provides some basic information about our auditory system. The tools used to ...

*Tinnitus

"Residual inhibition functions overlap tinnitus spectra and the region of auditory threshold shift". Journal of the Association ... When the tinnitus is caused by disorders of the inner ear or auditory nerve it is called otic (from the Greek word for ear). ... Normal hearing threshold is generally defined as 0-20 decibels (dB). Normal loudness discomfort levels are 85-90+ dB, with some ... When there does not seem to be a connection with a disorder of the inner ear or auditory nerve, the tinnitus is called nonotic ...

*Auditory fatigue

This results in a temporary shift of the auditory threshold known as a temporary threshold shift (TTS). The damage can become ... Temporary threshold shifts related to auditory fatigue are related to the amplitude of a stimulus-driven traveling wave. This ... Auditory fatigue can be explained by the relative activity of the active process at low-level stimulation (. <"Archived copy". ... There are two main types of auditory fatigue, short-term and long-term. These are distinguished from each other by several ...

*Lateralization of bird song

"Colony differences in auditory thresholds in the canary (Serinus canarius)", J. Acoust. Soc. Am., 78: 1170, doi:10.1121/ ... Possibly explaining their strong left lateralization, canaries of the waterschlager strain contain an inherited auditory defect ...

*Frequency following response

Also, phase-locked neural activity reflected in the FFR has been successfully used to predict auditory thresholds. Currently, ... Evoked potential Auditory brainstem response Burkard, R., Don, M., & Eggermont, J. J. Auditory evoked potentials: Basic ... Moore EJ (1983). Bases of auditory brain-stem evoked responses. Grune & Stratton, Inc. Skoe, E; Kraus, N (June 2010). "Auditory ... doi:10.1007/s10162-011-0284-1. Chertoff, ME; Hecox, KE (March 1990). "Auditory nonlinearities measured with auditory-evoked ...

*Occupational noise

Hazardous industrial noise can cause a permanent auditory threshold shift as excessive exposure to loud noises can damage the ... Industrial noise or occupational noise is the amount of acoustical energy (noise) received by an employees auditory system ...

*Safe to Sleep

Rechtschaffen A; Hauri P; Zeitlin M (June 1966). "Auditory awakening thresholds in REM and NREM sleep stages". Percept Mot ... In both human infants and rats, arousal thresholds have been shown to be at higher levels in the electroencephalography (EEG) ... In 1992 a SIDS risk reduction strategy based upon lowering arousal thresholds during SWS was implemented by the American ... Ashton R (April 1973). "The influence of state and prandial condition upon the reactivity of the newborn to auditory ...

*SLC25A21

... increased mean platelet volume and moderate elevations in auditory thresholds. GRCh38: Ensembl release 89: ENSG00000183032 - ...

*Peter Dallos

Effect on behavioural auditory threshold, Nature 253: 44-46 (1975) Dallos, P. and D. Harris, Properties of auditory nerve ... First explanation of what determines low-frequency auditory threshold [2.5] Discovery that inner hair cells respond to basilar ... The Cochlea Volume 8 in: Springer Handbook of Auditory Research, series editors A. Popper and R. Fay (Springer-Verlag, New York ... He was the founding Editor-in-Chief of the journal Auditory Neuroscience (1994-97), served on the Council of Neurology ...

*ICD-10 Chapter VIII: Diseases of the ear and mastoid process

Other abnormal auditory perceptions Auditory recruitment Diplacusis Hyperacusis Temporary auditory threshold shift (H93.3) ...

*List of MeSH codes (F02)

... auditory perception MeSH F02.463.593.071.173 --- auditory threshold MeSH F02.463.593.071.173.095 --- auditory fatigue MeSH ... auditory threshold MeSH F02.463.593.710.370 --- differential threshold MeSH F02.463.593.710.560 --- pain threshold MeSH F02.463 ... taste threshold MeSH F02.463.593.725 --- size perception MeSH F02.463.593.752 --- social perception MeSH F02.463.593.778 --- ... pain threshold MeSH F02.830.816.541 --- proprioception MeSH F02.830.816.541.504 --- kinesthesis MeSH F02.830.816.643 --- smell ...

*Audiogram

Auditory Thresholds. ... Hearing thresholds of humans and other mammals can be found by ... The threshold of hearing is plotted relative to a standardised curve that represents 'normal' hearing, in dB(HL). They are not ... This is not the best threshold found for all subjects, under ideal test conditions, which is represented by around 0 Phon or ... An audiogram is a graph that shows the audible threshold for standardized frequencies as measured by an audiometer. The Y axis ...

*Perception of infrasound

The auditory sensitivity curve of this particular elephant began at 16 Hz with a threshold of 65 dB. A shallow slope decreased ... To determine auditory sensitivity thresholds, a certain frequency of sound is presented at various intensities to see at which ... The auditory sensitivity thresholds have been measured behaviorally for one individual young female Indian elephant. The ... Delius, J. D.; R. M. Tarpy (1974). "Stimulus control of heart rate by auditory frequency and auditory pattern in pigeons". ...

*Auditory brainstem response

... auditory threshold estimation, intraoperative monitoring, determining hearing loss type and degree, and auditory nerve and ... Picton TW, Dimitrijevic A, Perez-Abalo MC, Van Roon P (March 2005). "Estimating audiometric thresholds using auditory steady- ... Bone conduction ABR thresholds can be used if other limitations are present, but thresholds are not as accurate as ABR ... The auditory structures that generate the auditory brainstem response are believed to be as follows: Wave I through III - ...

*Evoked field

Auditory evoked field at threshold. Hear Res. 2007 Jun;228(1-2):188-200. Epub 2007 Mar 14. Naka D, Kakigi R, Hoshiyama M, ... An auditory evoked field (AEF) is a form neural activity that is induced by an auditory stimulus and recorded via ... The main source of the auditory evoked field is the auditory cortex and the association cortices. The earliest cortical ... Magnetoencephalographic studies of auditory system function. J Clin Neurophysiol. 1994 May;11(3):343-64. Kuriki S, Nogai T, ...

*Auditory event

Determination of perception thresholds like hearing threshold, auditory masking thresholds etc. Which characteristics has the ... Aspects of auditory event investigations can be: is there an auditory event? Is a certain sound noticeable? => ... When can differences in auditory events be noticed? How big are the discrimination possibilities of the auditory system? => ... in order to distinguish clearly between the physical sound field and the auditory perception of the sound. Auditory events are ...

*Stochastic resonance (sensory neurobiology)

The auditory intensity detection thresholds of a number of human subjects were tested in the presence of noise. The subjects ... If this image is passed through a nonlinear threshold filter in which each pixel detects light intensity as above or below a ... A similar output could be achieved by examining multiple threshold levels, so in a sense the addition of noise creates a new ... The intensity of the pressure signal was tested without noise and then set at a near sub-threshold intensity that would evoke ...

*Pure tone audiometry

Hearing range Auditory masking Auditory filters Absolute threshold of hearing Equal-loudness contours Audiology Pure-Tone ... Thus, thresholds obtained when masking has been applied, provide an accurate representation of the true hearing threshold level ... Prevalence of Self-perceived Auditory Problems and their Relation to Audiometric Thresholds in a Middle-aged to Elderly ... The threshold of the test ear is measured at the same time as presenting the masking noise to the non-test ear. ...

*Glutathione peroxidase

Gpx1 −/− mice showed up to 16 dB higher auditory brainstem response (ABR) thresholds than control mice. After 110 dB noise ...

*Static electricity

... such low spark energy is often below the threshold of human visual and auditory perception. Typical ignition energies are: ...

*Auditory masking

... in the time domain is known as temporal masking or non-simultaneous masking. The unmasked threshold is the ... In fact, auditory bandwidths measured from forward masking thresholds are narrower and more accurate than those measured using ... Auditory masking occurs when the perception of one sound is affected by the presence of another sound. Auditory masking in the ... This can be explained by the auditory system having an auditory filter which is centered over the frequency of the tone. The ...

*Prostaglandin EP4 receptor

Pre- and post-treatment of guinea pigs with an EP4 agonist significantly attenuated threshold shifts of auditory brain stem ...

*TTS

... a method of phylogenetic reconstruction Time translation symmetry in physics Temporary threshold shift or auditory fatigue Audi ...

*Electrocommunication

Tuberous electroreceptors show a V-shaped threshold tuning curve (similar to auditory system), which means that they are tuned ...

*Activity-specific approach in temperament research

... absolute threshold in visual, auditory, and tactile modalities, strength of excitation and mobility in auditory and visual ...

*Diplacusis

If one ear has normal thresholds and one has SNHL (a unilateral loss), there is a lot of diplacusis. As much as 15 - 20% (for ... is a type of hearing disorder that is the perception of a single auditory stimulus as two separate sounds which may differ in ...
Has your doctor changed your blood test frequency in conjunction with your methotrexate regimen? Heres the information you need about methotrexate and blood tests.
In AMRRIs condition monitoring program the test slates, test frequencies, and targets are established based on equipment criticality, failure modes, and the customers machine reliability objectives.
Find right answers right now! What is the the number of octaves in the range from 20 Hz to 40 kHz ? More questions about Chemistry, what
Objective: The aim of the current study was to assess aided speech-in-noise outcomes and relate those measures to auditory sensitivity and processing, different types of cognitive processing abilities, and signal processing in hearing aids.. Material and method: Participants were 200 hearing-aid wearers, with a mean age of 60.8 years, 43% females, with average hearing thresholds in the better ear of 37.4 dB HL. Tests of auditory functions were hearing thresholds, DPOAEs, tests of fine structure processing, IHC dead regions, spectro-temporal modulation, and speech recognition in quiet (PB words). Tests of cognitive processing function were tests of phonological skills, working memory, executive functions and inference making abilities, and general cognitive tests (e.g., tests of cognitive decline and IQ). The outcome test variables were the Hagerman sentences with 50 and 80% speech recognition levels, using two different noises (stationary speech weighted noise and 4-talker babble), and three ...
Hearing is tested by auditory brain stem recordings (Tucker-Davis). Anesthetized mice are placed in a sound-attenuated chamber. Tone bursts (2 ms duration at 8, 16 and 32 kHz) and click stimuli (1 ms duration) are presented (21 per sec) via a free field electrostatic speaker. Responses are recorded over 10 ms. 1000 recordings are averaged. Click and tone burst stimuli are presented at intensities varying between 90 and 10 dB SPL in 10 dB intervals. Auditory thresholds are obtained by a visual comparison of wave forms.. ...
If available in the product, the tinnitus masker is activated on the Fitting , Tunning screen in the Tinnitus Masker task box. Here you can select which device has the tinnitus masker enabled for the currently selected program. After activating the feature, you can also indicate whether or not the client control on the hearing instrument or remote control will adjust the masker level while in the currently selected program. The prescribed noise level can also be manipulated in the software via the provided controls.. ...
Estimates of cochlear traveling wave velocity (TWV) were computed from derived band auditory brain-stem response (ABR) latencies in 24 normal-hearing subjects. Wave V latencies were determined for each of six derived frequency bands (unmasked-8 kHz, 8-4 kHz, 4-2 kHz, 2-1 kHz, 1 kHz-500 Hz, and 500-250 Hz). Representative frequencies were assigned to the derived bands by estimating their energy midpoints, and cochlear positions corresponding to these frequencies were determined using Greenwoods [J. Acoust. Soc. Am. 33, 1344-1356 (1961)] place-frequency function for humans. Two procedures were used to estimate TWV. In one procedure, an exponential function of the form l = A + BeCd was fitted to each subjects latency-by-distance data using a least-squares algorithm, and a TWV function was generated by taking the inverse derivative of the latency function with respect to time. In the second procedure, average TWVs between adjacent derived bands were computed directly from subjects ipsilateral wave V
We can better estimate an audio system if errors can be assigned audible significance. Recently established data of the auditory filter is developed into models that predict the audibility, detectability and loudness or errors. Errors are assessed by frequency, loudness, temporal and spatial summations. The models explain critical-band phenomena and several types of masking anomalies. Particular attention is paid to determining the audibility of different noise-bands, especially near absolute...
The well - selected testing machines enable fatigue testing of materials samples and components at very high test frequencies (f ≤ 20 kHz), allowing a highly accelerated determination of cyclic material characteristics. Significantly shorter test times are advantageous, for example, in the development accompanying component validation or the time-critical analysis of different development approaches. This so-called short-term diagnosis allows to provide fast data for FE calculations or to evaluate different manufacturing parameters in relative comparison. Especially in the range of very high load cycles, the state (for example microstructural change due to heat treatment) of the investigated material can decisively influence the fatigue behavior. As a result, a lifetime prediction with known regulations such as the FKM guideline - Computational fatigue analysis for machine components, may be too conservative or the strength capacity of the material is overestimated. For the best possible ...
In the article "An Improved Model for the Rate-Level Functions of Auditory-Nerve Fibers" by Peter Heil, Heinrich Neubauer, and Dexter R. F. Irvine, which appeared on pages 15424-15437 of the October 26, 2011 issue, the authors regret a mistake in Equation 7. KAA−1 should have read KAA. The corrected equation is listed below. ...
Street & Keep track of faulted the suspension and regular drum brakes, calling the latter a "really serious deficiency," but praised the confirmed 1.6 L Kent engine, adapted from European Fords. The larger 2300 inline-4 found in the Chevrolet Vega was an modern, new layout making use of an aluminum alloy block and iron head, but wanted a lot more growth function as at first launched ...
The TREND and GROWTH functions are array functions that create series of values based on regression techniques. TREND produces a straight line if depicted in a chart and GROWTH produces an exponential line, typically curved. Highlight multiple cells before entering these functions. Press Ctrl+Shift+Enter.
Excellent, bobbym!. #1096. Name the medical term / phrase : An umbrella term for a variety of disorders that affect the way the brain processes auditory information. Individuals with APD usually have normal structure and function of the outer, middle and inner ear (peripheral hearing). However, they cannot process the information they hear in the same way as others do, which leads to difficulties in recognizing and interpreting sounds, especially the sounds composing speech. It is thought that these difficulties arise from dysfunction in the central nervous system.. ...
Masker Motor, Karet Silikon, Elastis, Tidak Panas, Dapat Dicuci, Sirkulasi Udara Yang Baik, Terdapat Kain Tipis Sebagai Filter murah dengan spesifikasi sesuai kebutuhan Anda. Gratis ongkos kirim dan bisa dicicil dengan bunga cicilan 0%
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TY - JOUR. T1 - Comparison of beyer dt48 and etymotic insert earphones. T2 - Auditory brain stem response measurements. AU - Beauchaine, K. A.. AU - Kaminski, J. R.. AU - Gorga, Michael P. PY - 1987/10. Y1 - 1987/10. N2 - Click-evoked auditory brain stem responses (ABRs) were measured using a Beyer DT48 circumaural earphone and an Etymotic ER-3A insert earphone in a group of normal-hearing subjects. Comparisons were made between time waveforms and amplitude spectra for the two transducers. ABR waveforms, latencies, and thresholds were compared for the two transducers. Click-evoked ABR and behavioral thresholds were comparable for the two earphones. In addition, absolute response-component latencies differed by an amount that was equivalent to the travel time introduced by the insert earphones sound-delivery tube. Inter-peak latency differences were virtually identical. These findings suggest that the insert earphone is a viable transducer for clinical ABR evaluations. Further, a temporal ...
BACKGROUND: Self-reported hearing measures are useful for surveying hearing loss in a population because they are short, and easy to administer by either questionnaire or telephone. This study aims to assess the performance of several self-reported hearing measures to identify hearing loss in a group of Iowa farmers. METHODS: The study subjects were 98 male farmers who participated in the Iowa Fa
TY - JOUR. T1 - Combining Wavelet Analysis and Bayesian Networks for the Classification of Auditory Brainstem Response. AU - Zhang, R. AU - McAllister, G. AU - Scotney, BW. AU - McClean, SI. AU - Houston, G. N1 - Other Details ------------------------------------ This paper was selected (with re-review) for journal publication from papers presented at the 18th IEEE International Symposium on Computer-Based Medical Systems, June 2005. The paper develops an algorithm that enables hearing response to be assessed using less than one-tenth of the data (from auditory brainstem responses to stimuli) typically required by techniques currently used by audiologists. Thus the length of assessment sessions may be reduced, with corresponding reductions in patient discomfort and audiologists time. Hearing classification accuracy has been evaluated in collaboration with (and using data provided by) an Audiological Scientist at the Royal Hospitals, Belfast (Glen Houston).. PY - 2006/7/1. Y1 - 2006/7/1. N2 - ...
Over the last twenty years there has been a revolution in our understanding of the mechanisms of sound analysis in the normal cochlea. Along with this, the mechanisms associated with cochlear hearing loss are also much better understood. However, these improvements in our understanding have been mainly in terms of physiological mechanisms. This book emphasizes the perceptual changes associated with cochlear hearing loss and relates these to the underlying physiological mechanisms. This provides a theoretical framework for understanding and interpreting the perceptual changes. The results obtained with hearing-impaired people have important implications for theories of normal perception, especially in relation to loudness, temporal processing, and pitch perception. The data and theories surveyed are used to draw up guidelines for the design of signal-processing hearing aids to compensate for perceptual abnormalities.
An auditory brainstem response (ABR) test is a safe and painless test that gives health care providers information about possible hearing loss.
Hearing screening should be conducted in a clinical or natural environment that is conducive to obtaining reliable screening results and that is free from auditory and visual distractions and interruptions. In addition, the location should allow for privacy and confidentiality.. Perform daily listening checks to rule out defects in major pure-tone screening components. Ambient noise levels may exceed ANSI standards for pure-tone threshold testing in audiometric test rooms (ANSI, 2013) but must be sufficiently low to allow accurate screening. A sound level meter, if available, may be used to establish maximum permissible noise levels at 25 dB HL for the earphone to be used during screening (i.e., supra-aural or insert earphones). However, when a sound level meter is not available, a biologic check is suitable.. ...
Gap detection threshold (GDT) is a commonly used measure of temporal acuity in cochlear-implant (CI) recipients. This measure, like other measures of temporal acuity, shows considerable variation across subjects and also varies across stimulation sit
Sound can be measured as a change in pressure when sound waves reach the ear or a measuring device. Sound exposure is usually measured in decibels of sound pressure level (dB SPL), which is a measure of the sound pressure level relative to the lowest hearing threshold of the young, healthy ear set as 0 dB. The scale is logarithmic and a ten-fold increase in the sound pressure level measured corresponds to an increase by 20 dB SPL.
Summary and Objectives Explain key concepts such as visual acuity, auditory threshold, sensory integration, dynamic systems theory, integration and differentiation. Discuss the implications of critical methods and findings like habituation studies and moving room studies. Talk about why this matters by connecting perception with cognition. Links Perceptual Development Song (also as mp3) Hearing Milestones Vision Milestones All…
PubMed comprises more than 30 million citations for biomedical literature from MEDLINE, life science journals, and online books. Citations may include links to full-text content from PubMed Central and publisher web sites.
|P|PROBLEM TO BE SOLVED: To provide an information input/output device, with which information can efficiently be read or written from/to a card. |P|SOLUTION: The information input/output device 10, for transmitting information between itself and the information recording part 102 of the card 100, is provided with a card support part 12 having a card support face 11 for sliding the card 100; while it supports the card 100 from one side, a card striking part 20 having a card-striking face 21, which is arranged to protrude from the card support face 11; and an input/output execution part 32 which is arranged to face the information recording part 102 of the card 100, when the card 100 is made to slide on the card support face 11, while the card 100 is struck to the card striking face 21 and which reads information from the information recording part 102 or writes information into the information-recording part 102. |P|COPYRIGHT: (C)2005,JPO&NCIPI
The amount by which the SNR exceeds the detection threshold, DT, is called the signal excess (SE):. SE (decibels) = SNR - DT = (SL - 2TL + TS - NL) - DT. If the SE is greater than 0 dB, then the decision is made that the target is present. If the SE is negative, the decision is that the target is not present.. If the detection threshold is set high (which is equivalent to assuming that the signal power is high relative to the noise) only strong targets will exceed the threshold and be detected. There will not be many "false alarms" in which noise is mistakenly decided to be the signal of interest; however, there may be many "misses" in which the signal, though present, is not detected. If the threshold is set low, weaker targets will be detected, but the number of "false alarms" will also increase.. The following figure shows the importance of setting the detection threshold. The top trace (a) shows three target echoes with different amplitudes. The middle trace (b) shows the noise. The bottom ...
In the upper part of Figure 5 simulation results are shown for the MS-model with dissemination proportional to V2/3 and V1/3, the lower part shows the results for the GDR-model, again with a V2/3 and V1/3 dependency. For both models a variation of the growth characteristics with an artificially slewed down growth behaviour of the metastatic cells are calculated and included in the plots. For the GDR-model this growth behaviour was achieved by starting the metastatic growth process with the doubling rate of the time step the malignant cell has being disseminated. Taking the same generation time TG and error rate for mitosis as for the primary tumour, a reduced initial doubling rate consequently leads to a reduced maximal colony size of the metastases. The modified growth function for the MS-model was achieved by starting the metastatic growth just with the prolonged TG of the generation the cell was disseminated. The ageing process is inherited. These colonies will reach the same maximal size as ...
The thyroid is a small butterfly-shaped gland located at the front of the neck, and it performs a critical function: secreting hormones that regulate the metabolic and growth functions within the body.
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configuration, ,system.diagnostics, ,sources, ,source name="mySource" switchName="sourceSwitch" switchType="System.Diagnostics.SourceSwitch", ,listeners, ,add name="console" type="System.Diagnostics.ConsoleTraceListener", ,filter type="System.Diagnostics.EventTypeFilter" initializeData="Error"/, ,/add, ,remove name="Default"/, ,/listeners, ,/source, ,/sources, ,switches, ,add name="sourceSwitch" value="Warning"/, ,/switches, ,/system.diagnostics, ,/configuration ...
Eliminating Your Tinnitus Tinnitus is a condition characterized by swishing, buzzing, ringing, or other noises that appear to be originating in the head or ear. Prolonged exposure to loud sounds is one of the most common causes of tinnitus. Up … Continue reading →. ...
define TRACE using System; using System.IO; using System.Diagnostics; public class TextWriterTraceListenerSample { public static void Main() { TextWriterTraceListener myTextListener = null; // Create a file for output named TestFile.txt. String myFileName = "TestFile.txt"; StreamWriter myOutputWriter = new StreamWriter(myFileName, true); // Add a TextWriterTraceListener for the file. myTextListener = new TextWriterTraceListener(myOutputWriter); Trace.Listeners.Add(myTextListener); // Write trace output to all trace listeners. Trace.WriteLine(DateTime.Now.ToString() + " - Trace output"); // Remove and close the file writer/trace listener. myTextListener.Flush(); Trace.Listeners.Remove(myTextListener); myTextListener.Close ...
Happy Friday, listeners. This weeks episode was made up entirely of your questions, so if its lame, its totally your fault. And if its awesome, then you should pat yourself on the back for being so good at coming up with interesting thi...
A periodic alteration in some parameter of a signal. For example, a sine wave can have its amplitude changed (amplitude modulation or AM) or its frequency (frequency modulation or FM).. Amplitude modulation ...
Find Differential Amplifier Chips on GlobalSpec by specifications. Differential amplifier chips are designed to amplify the difference between two input signals. They can amplify a small difference between two signal levels and ignore any common level shared between them.
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Our very own Listener DJ Hour, which puts a different WFMU listener in the drivers seat each week for one hour of Freeform programming any way they choose! ...
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The super-heterodyne receiver has an IF of 470 kHz for AM and is tuned between the following frequency range 500 kHz 1500 kHz. · What would...
TY - JOUR. T1 - Auditory brainstem responses to tone bursts in normally hearing subjects. AU - Gorga, Michael P. AU - Kaminski, J. R.. AU - Beauchaine, K. A.. AU - Jesteadt, Walt. PY - 1988/1/1. Y1 - 1988/1/1. N2 - Auditory brainstem responses were recorded from 20 normally hearing subjects using tone-burst stimuli that were gated with cosine-squared functions. Clear responses were observed over a wide range of frequencies and levels. These responses were highly reproducible within individual subjects and were reliably measured by two independent examiners. ABR thresholds were higher than behavioral thresholds for all frequencies, especially for lower frequencies. Intersubject variability also was greater for lower frequencies. Wave-V latencies decreased with increases in both frequency and level for frequencies from 250 to 8000 Hz and for levels from 20 to 100 dB SPL. The standard deviations seldom exceeded 10% of the mean wave-V latency for any combination of level and frequency. These ...
The temporary threshold shift (TTS) caused by repeated short duration noise bursts lasting less than 1 second was studied. Eleven volunteers, aged 20 to 31 years, participated in the study. Each subject received a total of 21 separate noise exposures of 12.5, 50, 200, 800, and 3750 milliseconds (msec) duration. In the first experiment the different burst durations were employed at each of several
Studies of acoustic trauma (Miller et al., 1963) suggest the following: (1) noise-induced threshold shift increases only as long as the noise exposure continues, (2) threshold recovery begins soon after exposure termination, and (3) noise-induced threshold shift asymptotes to permanent and stable levels within 2-4 weeks after exposure. Findings from the present study challenge the universality of these notions. Specifically, we show that noise exposure can lead to threshold shifts that progress for years after the exposure and are associated with primary degeneration of the cochlear nerve. This neural etiology contrasts with the noise-induced hair cell (or stereocilia) damage that underlies the initially measured permanent threshold shifts (Liberman and Dodds, 1984) and contrasts with the aging process in unexposed mice, as shown here and by other studies reporting that cochlear neuronal loss is minimal in unexposed mice, even beyond 2 years of age (Lambert and Schwartz, 1982; Willott et al., ...
For clinical purposes, noise is measured in decibels weighted according to the sensitivity of the human ear (dB(A)). Regardless of source, the effects of overexposure to noise are similar. Initially there is a temporary threshold shift, where reversibility of hearing loss is possible with removal away from further noise. Permanent threshold shift occurs following prolonged and/or intense exposure, with poor prospects for improvement of hearing. The classical audiogram for noise-induced hearing loss shows a 4 kHz dip. Prevention is by reducing exposure to noise at source, and in the United Kingdom a limit for exposure has been set at 87 dB(A) averaged over an 8-h day or 140 dB(A) for any instantaneous impulse noise....
TY - JOUR. T1 - Central compensation in auditory brainstem after damaging noise exposure. AU - Schrode, Katrina M.. AU - Muniak, Michael. AU - Kim, Ye Hyun. AU - Lauer, Amanda M.. PY - 2018/7/1. Y1 - 2018/7/1. N2 - Noise exposure is one of the most common causes of hearing loss and peripheral damage to the auditory system. A growing literature suggests that the auditory system can compensate for peripheral loss through increased central neural activity. The current study sought to investigate the link between noise exposure, increases in central gain, synaptic reorganization, and auditory function. All axons of the auditory nerve project to the cochlear nucleus, making it a requisite nucleus for sound detection. As the first synapse in the central auditory system, the cochlear nucleus is well positioned to respond plastically to loss of peripheral input. To investigate noise-induced compensation in the central auditory system, we measured auditory brainstem responses (ABRs) and auditory ...
TY - GEN. T1 - On the synthesis of multiple frequency tone burst stimuli for efficient high frequency auditory brainstem response. AU - Ellingson, Roger M.. AU - Dille, Marilyn L.. AU - Leek, Marjorie R.. AU - Fausti, Stephen A.. PY - 2008. Y1 - 2008. N2 - The development and digital waveform synthesis of a multiple-frequency tone-burst (MFTB) stimulus is presented. The stimulus is designed to improve the efficiency of monitoring high-frequency auditory-brainstem-response (ABR) hearing thresholds. The pure-tone-based, fractional-octavebandwidth MFTB supports frequency selective ABR audiometry with a bandwidth that falls between the conventional click and single-frequency tone-burst stimuli. The MFTB is being used to identify high frequency hearing threshold change due to ototoxic medication which most generally starts at the ultra-highest hearing frequencies and progresses downwards but could be useful in general limitedbandwidth testing applications. Included is a Mathcad® implementation and ...
Identification of conductive hearing loss is a fundamental component of hearing assessment, yet situational and/or equipment constraints can render use of the traditional audiological test suite impractical or impossible. A combination of automatically administered pure-tone audiometry and a tone-in-noise detection task, both delivered via an air-conduction pathway, predicted the presence of an air-bone gap with a reasonably high degree of accuracy in 120 ears with a variety of hearing loss types. The prediction became more accurate with increasing air-bone gap size, with decreasing test frequency, and when multiple test frequencies were taken into account ...
PubMed comprises more than 30 million citations for biomedical literature from MEDLINE, life science journals, and online books. Citations may include links to full-text content from PubMed Central and publisher web sites.
The D-galactose induced mimetic aging rat model has been widely used in studies of age-associated diseases recently. Evidence indicates that D-GAL could also play a key role in age-related hearing loss. However, there is conflicting data about the relationship between the D-GAL injection and tone-burst auditory brainstem responses (ABRs). The present study aimed to compare ABRs in D-GAL injected rats compared with young and naturally aged rats. Tone-burst ABR was recorded and analyzed at the frequencies of 4,6,8,12 and 16 kHz in male young (3-month-old, n=10), naturally aging (18-month-old, n=10) and D-GAL injected (3-month-old, 500 mg/kg D-GAL injection for 8 weeks, n=10) Wistar rats. When the ABRs thresholds obtained in the D-GAL group and the natural aging group were compared with the thresholds in the young group, we observed a significant increase in thresholds, which affected all of the frequencies (P<0.05). A statistically significant decrease in amplitude of wave PI at 4 and 8 kHz, PII at 4,8
The three general approaches for assessing the mouse auditory system presented in UNITS 8.21B-8.21D are complementary, but differ in the time required for testing as well as the goals of the tests: the auditory brainstem response (ABR; UNIT 8.21B), distortion product otoacoustic emissions (DPOAE; UNIT 8.21C), and lick suppression behavioral test (UNIT 8.21D). Various issues that need to be addressed in the testing of mouse hearing are discussed in this overview, including accurate nomenclature of the strain and/or mutations, environmental versus genetic influences, selection of frequencies to be tested, and appropriate animal care and use.
Fifteen infants with hydrocephalus ranging in age from 32 to 43 weeks from conception were studied. The auditory brainstem response (ABR) was measured 48 h prior to the placement of a CSF shunt and...
Learn more about Auditory Brainstem Response Evaluation research from experts at Boston Childrens Hospital, ranked best Childrens Hospital by US News.
Auditory fatigue is now known as Temporary Threshold Shift (subsequently abbreviated to TTS). It has been defined as the temporary elevation in the absolute threshold of hearing for a given test sound resulting from preceding auditory stimulation by a given stimulus sound (see Hirsh, 1952, page 177). Associated with the phenomenon there are six physical variables which sub-divide themselves into stimulus, test and recovery factors. In IMS study each of the latter factors was systematically Investigated using four groups of six undergraduate subjects. Thresholds were measured using the Bek6sy (1947) technique of threshold measurement. Control experiments were carried out to verify that TTS results from the application of the stimulus tone, to study the mechanisms involved in the Bekesy technique of threshold measurement and the effects of this technique on the measurement of TTS, to investigate any additive effects of TTS and to study the possibility of any measurement errors resulting from the ...
CARVALHO, Lídia Raquel de; PINHO, Sheila Zambello de and MISCHAN, Martha Maria. Methods to verify parameter equality in nonlinear regression models. Sci. agric. (Piracicaba, Braz.) [online]. 2010, vol.67, n.2, pp.218-222. ISSN 1678-992X. http://dx.doi.org/10.1590/S0103-90162010000200014.. In biologic experiments, in which growth curves are adjusted to sample data, treatments applied to the experimental material can affect the parameter estimates. In these cases the interest is to compare the growth functions, in order to distinguish treatments. Three methods that verify the equality of parameters in nonlinear regression models were compared: (i) developed by Carvalho in 1996, performing ANOVA on estimates of parameters of individual fits; (ii) suggested by Regazzi in 2003, using the likelihood ratio method; and (iii) constructing a pooled variance from individual variances. The parametric tests, F and Tukey, were employed when the parameter estimators were near to present the properties of ...
You sort of answered your own question. Loudness is a subjective impression of signal level. Its generally believed that the perception of loudness is non-linear and correlated with a number of psychoacoustic factors. Therefore, does it really matter to the end-user what the actual sound pressure level is of each PC component separately? I would argue that it does not matter as much as one might be inclined to believe. In other words, SPL is quite different from most other PC benchmarks whose scores have a more generalizable meaning. Yes, it is important for reviewers, such as SPCR to be able to measure noise performance, especially across the entire audible spectrum. After all, we, the readers, are interested in knowing which components are quieter than others. But, the actual perception of loudness of a system composed of those benchmarked components, will often be different for different end-users. Mike sometimes remarks in his reviews, quite correctly, that the SPL values obtained are ...
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The Aurvana X-Fi earphones feature active technology, which means that they require power to operate and can be turned on or off. These controls are located on the right ear piece, and they include Noise Cancellation, X-Fi Crystalizer and X-Fi CMSS 3D. In terms of active noise cancellation, the Aurvana X-Fi managed to block out simulated pink noise of 125Hz and 8kHz flawlessly, while allowing the mid range frequency of 1kHz to slip through. This is understandable since this model was designed to block out very low frequency noise like the low rumble of a plane for example ...
Murata Official product details information. Here are the latest datasheet, appearance & shape, specifications, features, applications, product data of Filters CFWLB455KEFA-B0.Specifications:Operating Temperature Range=-20℃ to 80℃,Shape=Lead,Elements=6,Center Frequency=455.0kHz,Nominal Center Value=Yes,6dB Bandwidth=fn±7.5kHzmin.,Stop Bandwidth=15.0kHz,Area of Stop Bandwidth=[within 50dB],Stop Band Attenuation=35dB[within fn±100kHz],Insertion Loss=6.0dB[at minimum loss point],Ripple=3.0dB[within fn±5kHz],Input/Output Impedance=1500ΩOther Usage=Communication Equipment
Murata Official product details information. Here are the latest datasheet, appearance & shape, specifications, features, applications, product data of Filters CFWLB455KGFA-B0.Specifications:Operating Temperature Range=-20℃ to 80℃,Shape=Lead,Elements=6,Center Frequency=455.0kHz,Nominal Center Value=Yes,6dB Bandwidth=fn±4.5kHzmin.,Stop Bandwidth=10.0kHz,Area of Stop Bandwidth=[within 50dB],Stop Band Attenuation=35dB[within fn±100kHz],Insertion Loss=6.0dB[at minimum loss point],Ripple=2.0dB[within fn±3kHz],Input/Output Impedance=2000ΩOther Usage=Communication Equipment
Top ⭐ 21 reasons for Bang & Olufsen Beoplay H6 Limited Edition vs Shure SRH750DJ: 1. highest frequency 2. lowest frequency 3. weight 4. impedance 5. sound pressure level
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Bruce- The Loudness Toolbox assumes your inputs to the functions are in Pascals. Here is a simple check that one of the wavefiles labeled as 60dBSPL in the Loudness_Validation.m script, uses this calibration convention and is, in fact, 60dBSPL. [Tone_1kHz_60dBSPL,fs,bits] = wavread(fullfile(WAV,ToneBurst_1000Hz_60dBSPL_200ms.wav)); Verify_Tone_dBSPL = 20*log10(sqrt(var(Tone_1kHz_60dBSPL(1000:8000)))./20e-6) Verify_Tone_dBSPL = 59.9960 In MATLAB, any vector you send to one of the loudness functions should use this convention (1 Pa = 94dBSPL). When you input your 94dBSPL calibration tone as a time series to the loudness functions, please verify that the RMS value is 1. If it isnt, then you need to multiply by a scale factor so that your RMS value is 1. Also, its important to make sure you are taking the RMS of only the steady state portion of the signal, hence the use of only a portion of the file in the above example, Tone_1kHz_60dBSPL(1000:8000). I hope this helps. -Tony -- Tony Miller ...
i-Sound WMA MP3 Recorder 6.60, My small home recording studio. Long time ago, in pre-digital era, we have only one, but really universal method to record any sound we ever can hear, named tape-recorder. The method was quite dumb, but very reliable: after pushing Record button it has recorded really *anything*. And what we have now, with our cool-almighty-smart-digital computers? Have you software, which can with record equal ...
Jeeze, I hope he is jesting. If not he needs to get a life. some people can only learn the hard way. then, there are those who never learn how to grasp what is important in this world. so, if he is one, let him live in his rinky tinky house with his rinky tinky car and his rinky tinky bank account to his rinky tinky grave. You can lead a horse to water but you cant make him drink.. Who said the horse wanted you to lead him. I cant beleive all the people who actually think that people give a flop of what they think. I beleive that original post was bait for folks like yourself. Whats your argument? Please tell us. Its getting late and Im tired of drudgery ...
Last Update: 1/8/2008 Description:. Since the introduction of G4 input/output modules in the mid-1980s, Opto 22 has sold millions. And 20 years later, these remain some of the companys best-selling products. Like most Opto 22 modules, G4s are guaranteed for life. In order to make this guarantee, the company must submit the modules to rigorous testing before theyre shipped to customers ...
TLCs goal is to provide the latest news, sports, and entertainment possible. We strive to bring these to you with the absolute highest level of accuracy and latest technology in order to bring value to our clients, listeners, and readers. We hope you enjoy this site. ...
Well it is time for call in Friday again, that means todays show is dedicated to the listeners and all about you. Today I answer your calls to 866-65-THINK
well need to know from someone who knows forsure, im a big guy about 6.3 265lbs i have a huge upper body but im not that tone at all i wont to get to...
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Objective. Deferoxamine therapy in lifelong transfusion-dependent anaemias, as beta-thalassemia major, is associated with an increased risk of ototoxic changes. With increasing survival rates, prevention and/or early detection of ototoxicity are important for providing management options. The predictive value of pure-tone audiometry in early detection of ototoxicity has been questioned, particularly in the higher frequencies. Otoacoustic emissions appear to be more sensitive to cochlear insult than the conventional pure-tone audiometry. The aim of our study was to compare the efficacy of otoacoustic emissions (distortion-product otoacoustic emissions) with that of pure-tone audiometry as method of audiological monitoring ...
TY - JOUR. T1 - MB11 BERAphone and Auditory Brainstem Response in newborns at audiologic risk. T2 - Comparison of results. AU - Melagrana, Andrea. AU - Casale, Sara. AU - Calevo, Maria Grazia. AU - Tarantino, Vincenzo. PY - 2007/8. Y1 - 2007/8. N2 - Objective: To compare the diagnostic effectiveness of Automated Auditory Brainstem Responses (MB11 technique) with that of standard Auditory Brainstem Responses (ABR) in a sample of newborns evaluated after the second month of life. Methods: From October 2002 to February 2005, audiologic evaluations were performed in full-term newborns who presented altered otoacoustic emissions and in newborns considered at audiologic risk admitted to the ENT (Ear Nose Throat) Unit of Giannina Gaslini Institute, Genoa, Italy. Our sample included 201 children (104 males and 97 females) who underwent on the same day an audiologic test using MB11 BERAphone Maico and standard ABR test. Results: Out of the 388 ears examined, 378 (97.4%) showed agreement between the two ...
On the basis of recent advances in auditory physiology, new tests of cochlear function have been developed using measures of otoacoustic emissions. In the present report, the clinical potential for each of the four basic emission types is examined. In addition, the practical advantages of examining the ear with two specific types of evoked emissions, transiently evoked and distortion-product otoacoustic emissions, are reviewed in detail. Finally, the future role of tests of otoacoustic emissions in the diagnosis of hearing impairment is discussed. The current view is that evoked emissions hold promise as an essential part of the clinical examination of the auditory system.. ...
Poster #365: 2012 Consensus Pap Test Guidelines Womens Perceptions and Expectations SAN FRANCISCO - Women know that Pap tests are a useful screening test for cervical cancer, but according to a new study led by researchers at the Perelman School of Medicine at the University of Pennsylvania, most of those surveyed are unaware of the updated screening guidelines for the appropriate frequency of Pap tests in low-risk women. Nearly half of women were unsettled by the idea of spacing out Pap tests and reported that they planned to continue annual testing despite the change in recommendations. Results of the study were presented earlier this week at the 2015 American Congress of Obstetricians and Gynecologists Annual Clinical and Scientific Meeting in San Francisco.. In March 2012, revised consensus screening guidelines were released by the American Cancer Society, the American Society for Colposcopy and Cervical Pathology, and the American Society for Clinical Pathology and soon after endorsed by ...
Characteristics of Auditory Brainstem Response Latencies in Children with Autism Spectrum Disorders. Dr. ABEIR OSMAN DABBOUS Professor of Audiology (Audio-Vestibular Medicine), Kasr Al-Ainy Faculty of
... - Piezoelectric earphones also known as crystal earphones are the most sensitive earphones. In fact they are at least 10 times more sensitive than very sensitive magnetic earphones, dynamic earphones, and electrostatic earphones. Sensitive earphones have a very high impedance, which is measured in ohms.
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Trigger Listeners allow users to configure additional behavior related to trigger events as they are being processed.. For example, users may want to record autoscaling events to an external system, or notify an administrator when a particular type of event occurs or when its processing reaches certain stage (e.g., failed).. Listener configuration always refers to a specific trigger configuration because a listener is notified of events generated by that specific trigger. Several (or none) named listeners can be registered for a trigger, and they will be notified in the order in which they were defined.. Listener configuration can specify what processing stages are of interest, and when an event enters this processing stage the listener will be notified. Currently the following stages are recognized:. ...
Buy AfterShokz Trekz Titanium Bone Conduction Headphones - Pink at Argos.co.uk, visit Argos.co.uk to shop online for Headphones and earphones, iPod, MP3 and headphones, Technology
A tinnitus masker is basically, a device which emits white noise in order to overlay the noises caused by tinnitus. Tinnitus is not a condition per se; rather it is a group of symptoms which can be an indicator of another condition. These symptoms include buzzing, ringing or whistling sounds in the ear (or head). These sounds can drive you to distraction but what a masker does is to generate static sound. You gradually become accustomed to this and in time, stop noticing your tinnitus. It is not a curefor tinnitus or the underlying problem but it does ensure that it is less of a problem. The masker itself is an electronic piece of equipment which has been specially designed for this condition but it can be expensive. However you can use a similar device such as a radio which is cheaper and easy to use. All you do is set it so it isnt on a radio station -static sound -and play this a low volume. The idea behind this is that your brain will become slightly confused and will focus on this ...
A system operates to adaptively control the stability of an on-frequency repeater. A unique signature is imposed on RF signals transmitted by the repeater, and RF signals received by the repeater analyzed to detect signal components corresponding to the signature. The signature and the detected signal components are correlated by a micro-controller, which operates in accordance with an Adaptive Control Algorithm to adjust the ERP of RF signals transmitted by the repeater to limit signal leakage and thereby control the stability of the repeater.
A recent note from Valter Ciocca says: In support of Als point that pitch can be affected by grouping, Chris Darwin and I found that the pitch of a complex could be changed by mistuning one of its low-numbered components only when the mistuned component was grouped with the remaining components of the complex. This is a very nice result. Unfortunately, some other studies do not agree with the conclusion. In 1984 I did mistuned harmonic experiments with brief tones, using a 200 Hz complex tone with 7 harmonics, except that the fourth harmonic was mistuned. Experiment 1 found the amount of mistuning required to hear out the mistuned harmonic as a separate entity. For a tone duration of 40 ms this threshold mistuning was 22 Hz (2.75 % of the correct harmonic frequency of 800 Hz). For mistuning less than 22 Hz the complex was a single entity and the mistuned harmonic did not pop out. Experiment 2 measured the shift in the virtual pitch caused by mistuning of the fourth harmonic. (The virtual ...
Free Online Library: Reliability of interaural time difference-based localization training in elderly individuals with speech-in-noise perception disorder.(Original Article, Report) by Iranian Journal of Medical Sciences; Health, general Aged patients Health aspects Training Brain Localization of functions Research Elderly patients Localization (Brain function) Perception, Disorders of Perceptual disorders
Results】 The interpeak latency of waves I and V was normal in 9 patients and was marginally prolonged in 1 patient. While amplitudes of waves I and III were normal, we noted a decreased amplitude of wave V and/or an increased I/V amplitude ratio in 6 patients; ...
Below about 50 kHz the level of ambient noise in the sea increases continuously towards lower frequencies. In the infrasound range the spectral slope is particularly steep. This low-frequency noise may propagate long distances with little attenuation, causing a directional pattern of infrasound in the sea. Using a standing-wave acoustic tube, we have studied the sensitivity of cod to infrasound down to 0.1 Hz by means of the cardiac conditioning technique. The threshold values, measured as particle acceleration, showed a steady decline towards lower frequencies below 10 Hz, reaching a value close to 10(−5)ms-2 at 0.1 Hz. The spectrum level at 0.1 Hz in the sea ranges between 120 and 180 dB (re 1 microPa), with corresponding particle accelerations from less than 10(−6) to more than 10(−4)ms-2. The sensitivity of cod is thus sufficient to detect the highest levels of ambient infrasound, and we put forward the hypothesis that fish may utilize information about the infrasound pattern in the ...
This archive of alt.support.hearing-loss is sponsored by www.deaftalk.co.uk - providing coping strategies for deafness in a hearing world.. Newsgroups.Archived.At is © Copyright 2009-2018, A B Cryer, All Rights Reserved.. ...
This archive of alt.support.hearing-loss is sponsored by www.deaftalk.co.uk - providing coping strategies for deafness in a hearing world.. Newsgroups.Archived.At is © Copyright 2009-2018, A B Cryer, All Rights Reserved.. ...
The figure on p. 7 [PDF] shows a summary of how real ear information can be incorporated into planning an earmold. The shaded area is a target output range for a hearing aid (HA) based on the Desired Sensation Level (DSL) i/o algorithm. If we look at the hearing aid response in isolation, it appears to fall right into the target range. If we measure the ear canal resonance (REUR) and add it to the hearing aid response, we could say that were in really good shape. We might even think that the earmold is pretty inconsequential to the fitting. But unless we also measure the REOR and subtract it from the HA + REUR, we really miss the boat, so to speak. After subtracting the REOR from the HA + REUR, we get the actual aided response or REAR. In this example, the REAR falls short of the target and will need to be adjusted. The tricky thing about REOR is that each time we re-make the earmold, it can, and usually does, change ...
The wax moth doesnt hear equally well across the range. It is particularly good at picking up sounds in the 60 kHz range. For the wax moths to hear the end frequency sounds, they have to be much louder. At 60 kHz, the wax moths can pick up sounds of a volume about 50 decibels of sound pressure level (dB SPL); at 300 kHz, the sound has to be more like 90 dB SPL. Thats a loud sound. And at the very high end (280-300 kHz), some of the moths dont respond at all to even loud sounds, suggesting this is near the upper limit of their hearing ...
Auditory processing disorder (APD), also known as central auditory processing disorder (CAPD), is an umbrella term for a variety of disorders that affect the way the brain processes auditory information. Individuals with APD usually have normal structure and function of the outer, middle and inner ear (peripheral hearing). However, they cannot process the information they hear in the same way as others do, which leads to difficulties in recognizing and interpreting sounds, especially the sounds composing speech. It is thought that these difficulties arise from dysfunction in the central nervous system. The American Academy of Audiology notes that APD is diagnosed by difficulties in one or more auditory processes known to reflect the function of the central auditory nervous system. APD can affect both children and adults, although the actual prevalence is currently unknown. It has been suggested that males are twice as likely to be affected by the disorder as females, but there are no good ...
I dont think I have hyperacusis, just tinnitus or as I put it TINNITUS. I have tried an Internet search for the ANRs and thought that I had found some but when I called the salesperson she said that the ANR would only work when they were plugged in. Not sure about that or if she knew what she was talking about. So I was hoping someone would know about a brand (hopefully less expensive than Bose Q2s) that meets my specifications. As to not letting tinnitus direct my life, I have found that the best way to deal with it is to stay just as busy as I possible can. Even an hour in a day is too much down time. Keeps me exhausted but then again with 3 mg. of melatonin I sleep like a baby ...
Comfort Audio Duett New Personal Listener Carrying Bag - Get the lowest price on Comfort Audio Duett New Personal Listener Carrying Bag, online at AllegroMedical.com.
Comfort Audio Duett New Personal Listener - Get the lowest price on Comfort Audio Duett New Personal Listener, online at AllegroMedical.com.
The theory and application of control engineering will be discussed. System Modelling: Linear, nonlinear, time invariant, regulator and servomechanisms. Modelling system dynamics by transfer functions, block diagrams, state models. System Response: Transient response of second order systems. Steady state response, steady state errors, frequency response. Stability: simple stability tests, Routh Hurwitz, root locus, Bode and Nyquist. Methods used for design and compensation of control systems such as PID, Ziegler-Nichols tuning rules, lead and lag compensator will be examined. MATLAB software package will be used for control system design and analysis.. ...
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Hi guys I want to compute SPL spectrum of my fluctuating pressure that I have monitored at a point in my domain. Does anyone know how to do that.
TY - CONF. T1 - Relations between frequency selectivity, temporal fine-structure processing, and speech reception in impaired hearing. AU - Strelcyk,Olaf. AU - Dau,Torsten. N1 - Copyright 2009. Acoustical Society of America. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the Acoustical Society of America.. PY - 2009. Y1 - 2009. N2 - Frequency selectivity, temporal fine-structure (TFS) processing, and speech reception were assessed for six normal-hearing (NH) listeners, ten sensorineurally hearing-impaired (HI) listeners with similar high-frequency losses, and two listeners with an obscure dysfunction (OD). TFS processing was investigated at low frequencies in regions of normal hearing, through measurements of binaural masked detection, tone lateralization, and monaural frequency modulation (FM) detection. Lateralization and FM detection thresholds were measured in quiet and in background noise. Speech reception thresholds were ...
Noise-induced hearing loss affected people of all ages. Since the condition is irreversible, it's paramount that you protect your hearing. You should wear hearing protection devices when you are in noisy environments, watch the volume of the music you are listening to, among many other things.
Objectives. Young people are often exposed to high music levels which make them more at risk to develop noise-induced symptoms such as hearing loss, hyperacusis and tinnitus of which the latter is the symptom perceived the most by young adults. Although subclinical neural damage was demonstrated in animal experiments, the human correlate remains under debate. Controversy exists on the underlying condition of young adults with normal hearing thresholds and noise-induced tinnitus due to leisure noise. The present study aimed to assess differences in audiological characteristics between noise-exposed adolescents with and without noise-induced tinnitus (NIT).Methods. A group of 87 young adults with a history of recreational noise exposure was investigated by use of the following tests: otoscopy, impedance measurements, pure-tone audiometry including high-frequencies, transient and distortion product otoacoustic emissions, speech-in-noise testing with continuous and modulated noise (amplitude-modulated by
High dose sodium salicylate causes moderate, reversible hearing loss and tinnitus. Salicylate-induced hearing loss is believed to arise from a reduction in the electromotile response of outer hair cells (OHCs) and/or reduction of KCNQ4 potassium currents in OHCs which decreases the driving force for the transduction current. Therefore, enhancing OHC potassium currents could potentially prevent salicylate-induced temporary hearing loss. In this study, we tested whether opening voltage-gated potassium channels using ICA-105665, a novel small molecule that opens KCNQ2/3 and KCNQ3/5 channels, can reduce salicylate-induced hearing loss. We found that systemic application of ICA-105665 at 10 mg/kg prevented the salicylate-induced amplitude reduction and threshold shift in the compound action potentials recorded at the round window of the cochlea. ICA-105665 also prevented the salicylate-induced reduction of distortion products of otoacoustic emission (DPOAE). These results suggest that ICA-105665
An estimated 12.5% of children and adolescents aged 6-19 years (approximately 5.2 million) and 17% of adults aged 20-69 years (approximately 26 million) have suffered permanent damage to their hearing from excessive exposure to noise.3,4. Hearing loss can result from damage to structures and/or nerve fibers in the inner ear that respond to sound. This type of hearing loss, termed "noise-induced hearing loss," is usually caused by exposure to excessively loud sounds and cannot be medically or surgically corrected. Noise-induced hearing loss can result from a one-time exposure to a very loud sound, blast, or impulse, or from listening to loud sounds over an extended period.. ...

Auditory threshold financial definition of Auditory thresholdAuditory threshold financial definition of Auditory threshold

What is Auditory threshold? Meaning of Auditory threshold as a finance term. What does Auditory threshold mean in finance? ... Definition of Auditory threshold in the Financial Dictionary - by Free online English dictionary and encyclopedia. ... Threshold. (redirected from Auditory threshold). Also found in: Dictionary, Thesaurus, Medical, Legal, Encyclopedia. Threshold ... Auditory threshold financial definition of Auditory threshold https://financial-dictionary.thefreedictionary.com/Auditory+ ...
more infohttp://financial-dictionary.thefreedictionary.com/Auditory+threshold

Effect of absence of cochlear outer hair cells on behavioural auditory threshold.  - PubMed - NCBIEffect of absence of cochlear outer hair cells on behavioural auditory threshold. - PubMed - NCBI

Effect of absence of cochlear outer hair cells on behavioural auditory threshold.. Ryan A, Dallos P. ...
more infohttps://www.ncbi.nlm.nih.gov/pubmed/1110747?dopt=Abstract

ICD-10 Diagnosis Code H93.241 Temporary auditory threshold shift, right earICD-10 Diagnosis Code H93.241 Temporary auditory threshold shift, right ear

Short Description: Temporary auditory threshold shift, right ear Long Description: Temporary auditory threshold shift, right ... 388.40 - Abn auditory percept NOS (approximate) Approximate Flag. The approximate flag is on, indicating that the relationship ... One happens when your inner ear or auditory nerve is damaged. This type is usually permanent. The other kind happens when sound ...
more infohttps://icdlist.com/icd-10/h93241

Modeling of Auditory Neuron Response Thresholds with Cochlear ImplantsModeling of Auditory Neuron Response Thresholds with Cochlear Implants

... Frederic Venail,1,2 Thibault Mura,3,4 Mohamed Akkari,1 ... Displaying NRT thresholds as a function of auditory neuron frequency for each electrode (a) clearly reveals the large variation ... NRT thresholds, adjusted for scalar placement and impedance, may reflect auditory neuron sensitivity across the cochlea. ... Figure 6: Modeling of NRT threshold as a function of characteristic auditory neuron frequency ((a): univariate regression, (b ...
more infohttps://www.hindawi.com/journals/bmri/2015/394687/

Modeling of Auditory Neuron Response Thresholds with Cochlear ImplantsModeling of Auditory Neuron Response Thresholds with Cochlear Implants

... Frederic Venail,1,2 Thibault Mura,3,4 Mohamed Akkari,1 ... W. Lai and N. Dillier, "Neural adaptation and the ECAP response threshold: a Pilot Study," Cochlear Implants International, vol ... T. Wesarg, R.-D. Battmer, L. C. Garrido et al., "Effect of changing pulse rate on profile parameters of perceptual thresholds ... A. Botros and C. Psarros, "Neural response telemetry reconsidered: I. The relevance of ecap threshold profiles and scaled ...
more infohttps://www.hindawi.com/journals/bmri/2015/394687/ref/

Effect of antioxidant supplementation on the auditory threshold in sensorineural hearing loss: a meta-analysis | Brazilian...Effect of antioxidant supplementation on the auditory threshold in sensorineural hearing loss: a meta-analysis | Brazilian...

Effect on auditory threshold Results found Observations Joachims et al., 200327. Sudden hearing loss (,7 days). Group C: ... Although the control group showed a higher risk of auditory threshold worsening (RR=0.93 [0.82-1.05], p=0.24), there were no ... 1,0]Auditory thresholds increased in a similar number of patients from both groups, but with no statistical difference. The ... 3 and 4, the temporary change in the auditory threshold (at frequencies of 4 and 6kHz).25,26 Although the results showed a ...
more infohttp://bjorl.elsevier.es/en-effect-antioxidant-supplementation-on-auditory-avance-S180886941730143X

Auditory Filter Derivation at Low Levels where Masked Threshold I...: Ingenta ConnectAuditory Filter Derivation at Low Levels where Masked Threshold I...: Ingenta Connect

Auditory Filter Derivation at Low Levels where Masked Threshold Interacts with Absolute Threshold ... absolute threshold. The effects of this low level limit on the derivation of auditory filter shape are traditionally mitigated ... We show that the threshold limit can be explained by assuming that there is a noise floor in the cochlea. This more ... auditory filter model is remarkably good.. © 2018 The Author(s). Published by S. Hirzel Verlag · EAA. This is an open access ...
more infohttps://www.ingentaconnect.com/contentone/dav/aaua/2018/00000104/00000005/art00039

A comparison of the effects of isoflurane and ketamine anesthesia on auditory brainstem response (ABR) thresholds in rats.  -...A comparison of the effects of isoflurane and ketamine anesthesia on auditory brainstem response (ABR) thresholds in rats. -...

A comparison of the effects of isoflurane and ketamine anesthesia on auditory brainstem response (ABR) thresholds in rats.. ... Hearing threshold determination is often the primary interest. Although a number of studies have examined the effect of ... The auditory brainstem response (ABR) is an acoustically evoked potential commonly used to determine hearing sensitivity in ... The present study used a within-subject comparison and typical threshold criteria, to examine the effect of isoflurane and ...
more infohttps://www.ncbi.nlm.nih.gov/pubmed/22543090?dopt=Abstract

Development of auditory sensitivity of altricial birds: absolute thresholds of the generation of evoked potentials |...Development of auditory sensitivity of altricial birds: absolute thresholds of the generation of evoked potentials |...

The thresholds of the generation of EP in the L field of two to nine day old pied flycatcher nestlings in response to monotonal ... Entire Range Varied Frequency Absolute Threshold Threshold Time Auditory Sensitivity These keywords were added by machine and ... K. Okanoya and R. J. Dooling, "Hearing in passerine and psittacine birds: a comparative study of auditory thresholds,"J. Comp. ... Development of auditory sensitivity of altricial birds: absolute thresholds of the generation of evoked potentials. ...
more infohttps://link.springer.com/article/10.1007%2FBF01192385

Sound conduction Flashcards by Abi Chan | BrainscapeSound conduction Flashcards by Abi Chan | Brainscape

Auditory canal/external auditory meatus: Collects and conducts sound waves towards tympanic membrane to boost sound pressure ... Injury to central auditory pathway (would have to be bilateral to cause full deafness). Both are rare causes ... Caused by dysfunction of the cochlear or cochlear nerve so the signal to the auditory cortex is reduced or lost ... Primary auditory cortex (temporal lobe). [Collateral pathways to the reticular formation and cerebellum] ...
more infohttps://www.brainscape.com/flashcards/sound-conduction-5632146/packs/8269074

Frequency threshold curves and simultaneous masking functions in high-threshold, broadly-tuned, fibres of the guinea pig...Frequency threshold curves and simultaneous masking functions in high-threshold, broadly-tuned, fibres of the guinea pig...

... in single fibres of the auditory nerve. The recordings were made in guinea pigs with cochlear hearing losses. The masking ... Auditory Threshold / drug effects, physiology*. Evoked Potentials, Auditory / drug effects. Guinea Pigs. Loudness Perception / ... Frequency threshold curves and simultaneous masking functions in high-threshold, broadly-tuned, fibres of the guinea pig ... the masking function for low-threshold fibres had a shallower slope than the frequency-threshold curve. When the high-frequency ...
more infohttp://www.biomedsearch.com/nih/Frequency-threshold-curves-simultaneous-masking/6511675.html

Thresholds of Auditory-Motor Coupling Measured with a Simple Task in Musicians and Non-Musicians: Was the Sound Simultaneous to...Thresholds of Auditory-Motor Coupling Measured with a Simple Task in Musicians and Non-Musicians: Was the Sound Simultaneous to...

Thresholds of Auditory-Motor Coupling Measured with a Simple Task in Musicians and Non-Musicians: Was the Sound Simultaneous to ... Thresholds of Auditory-Motor Coupling Measured with a Simple Task in Musicians and Non-Musicians: Was the Sound Simultaneous to ... Thresholds of Auditory-Motor Coupling Measured with a Simple Task in Musicians and Non-Musicians: Was the Sound Simultaneous to ... pianists might have lower thresholds than brass players. Our results show that non-musicians exhibited higher thresholds for ...
more infohttp://libros.duhnnae.com/2017/jun8/149834086283-Thresholds-of-Auditory-Motor-Coupling-Measured-with-a-Simple-Task-in-Musicians-and-Non-Musicians-Was-the-Sound-Simultaneous-to-the-Key-Press.php

Transcranial Brain Stimulation: Science and EthicsTranscranial Brain Stimulation: Science and Ethics

Transient auditory threshold shift • Local pain and headache • Burns from scalp electrodes Theoretical Risks • Histotoxicity • ...
more infohttps://www.slideshare.net/jamsaul/transcranial-brain-stimulation-science-and-ethics

Temporary threshold and loudness shifts: frequency patterns and correlations.Temporary threshold and loudness shifts: frequency patterns and correlations.

Auditory Threshold. Fatigue. Humans. Loudness Perception*. Male. Psychoacoustics. From MEDLINE®/PubMed®, a database of the U.S ... In experiment 2, a TTS (temporary threshold shift) measurement after exposure to a 45-min, 1000-Hz tone at 90 dB was added to ...
more infohttp://www.biomedsearch.com/nih/Temporary-threshold-loudness-shifts-frequency/8473605.html

Evolução audiométrica em usuários de implante coclear multicanalEvolução audiométrica em usuários de implante coclear multicanal

Keywords : Cochlear Iimplantation; Audiometry; Auditory Threshold. · abstract in Portuguese · text in Portuguese · Portuguese ... PURPOSE: to evaluate how long after activation one can achieve the desired auditory thresholds in individuals multichannel ... RESULTS: we observed that 15 of the GI have reached around 30dBNA thresholds at 3 months after implant. The same happened to 26 ... We found significant interaction between time (F (3.140) = 91.973, p = 0.00) and the average hearing thresholds. Post-hoc ...
more infohttp://www.scielo.br/scielo.php?script=sci_abstract&pid=S1516-18462012005000037&lng=en&nrm=iso&tlng=en

Prevention of noise-induced hearing loss. - Semantic ScholarPrevention of noise-induced hearing loss. - Semantic Scholar

Guidelines for Auditory Threshold Measurement for Significant Threshold Shift.. *Kathleen Campbell, Tanisha L. Hammill, Michael ... The effects of auditory enrichment on zebrafish behavior and physiology. *Heloísa Helena de Alcântara Barcellos, Gessi Koakoski ...
more infohttps://www.semanticscholar.org/paper/Prevention-of-noise-induced-hearing-loss.-Dobie/e2efbff5453dfaddc05a7a6639de57f28f89e769

NIOSHTIC-2 Search Results - Full ViewNIOSHTIC-2 Search Results - Full View

Audiometric-testing; Auditory-threshold; Noise-control; Sound-levels; Hearing-impairment; Acoustic-environment ... exposure temporary threshold shifts (TTS) in the hearing of the workers. Application of the results of the noise survey results ...
more infohttp://www2a.cdc.gov/nioshtic-2/BuildQyr.asp?s1=temporary&f1=%2A&Startyear=&Adv=0&terms=1&EndYear=&Limit=10000&sort=&D1=10&PageNo=51&RecNo=501&View=f&

NIOSHTIC-2 Search Results - Full ViewNIOSHTIC-2 Search Results - Full View

Audiometric-testing; Auditory-threshold; Sound-levels; Noise-control; Hearing-impairment. Publication Date. ... the level of noise at 57 decibels has a significant effect resulting in less temporary threshold shift and a more rapid 30 ...
more infohttp://www2a.cdc.gov/nioshtic-2/BuildQyr.asp?s1=temporary&f1=%2A&Startyear=&Adv=0&terms=1&EndYear=&Limit=10000&sort=&D1=10&PageNo=50&RecNo=500&View=f&

Science Datasets - Data and Tools Page 8Science Datasets - Data and Tools Page 8

Auditory thresholds for bighead and silver carp after sound exposure determined by the AEP technique: Data Invasive silver ( ...
more infohttps://www.usgs.gov/products/data-and-tools/science-datasets?page=7

D:\ASDreams.org\projects\bibs\kramer.htmD:\ASDreams.org\projects\bibs\kramer.htm

AUDITORY THRESHOLDS IN THE DREAM DISTURBED. SLEEP RES., 13:102, 1984.. 78. KRAMER, MILTON; SCHOEN, LAWRENCE AND ANDERSON, ...
more infohttp://www.angelfire.com/ak/electricdreams/kramer.htm

NIOSHTIC-2  Publications Search - 00197926 - Asymptotic threshold shift in chinchillas exposed to impulse noise.NIOSHTIC-2 Publications Search - 00197926 - Asymptotic threshold shift in chinchillas exposed to impulse noise.

... an effort to more fully understand the results of long term exposures to impulse noise as they relate to asymptotic threshold ... Auditory thresholds were measured before exposure. Similar measurements were taken at 0.5, 1, 1.4, 2, 2.8, 4, 8, and 16 ... Threshold shift at 8kHz had reached an asymptotic level within 1 hour from the start of the exposure while threshold shift at ... NIOSH-Grant; Noise-induced-hearing-loss; Noise-exposure; Laboratory-animals; Hearing-threshold; Sensory-thresholds ...
more infohttps://www.cdc.gov/niosh/nioshtic-2/00197926.html

Development of brainstem auditory pathway in mallard duck embryos and hatchlings - Semantic ScholarDevelopment of brainstem auditory pathway in mallard duck embryos and hatchlings - Semantic Scholar

Although auditory sensitivity in the mid-frequency range (1.0, 1.5, 2.0, and 3.0 kHz) appeared 1-2 days later than in the low- ... In contrast, the development of auditory sensitivity in the low- and high-frequency ranges continued to develop after hatching ... The development of the brainstem auditory evoked potential (BAEP) was studied in mallard duck (Anas platyrhynchos) embryos and ... Auditory brainstem responses and auditory thresholds in woodpeckers.. *Bernard Lohr, Elizabeth F. Brittan-Powell, Robert J. ...
more infohttps://www.semanticscholar.org/paper/Development-of-brainstem-auditory-pathway-in-duck-Dmitrieva-Gottlieb/c0fca14ecfe65cc8afb8e4b0a34a43c0d37169b9

Purring.org - devoted to felid purringPurring.org - devoted to felid purring

Auditory Thresholds of the Cat. The Journal of the Acoustical Society of America, vol. 27, no. 3, pp. 480-483. ... The role of auditory feedback in the vocalizations of cats. Experimental Brain Research, vol. 69, 431-438. ...
more infohttps://www.ida.liu.se/~robek28/Purring.htm

NIOSHTIC-2 Search Results - Full ViewNIOSHTIC-2 Search Results - Full View

Audiometric-testing; Auditory-threshold; Sound-levels; Noise-control; Hearing-impairment. Publication Date. ... the level of noise at 57 decibels has a significant effect resulting in less temporary threshold shift and a more rapid 30 ...
more infohttp://www2.cdc.gov/nioshtic-2/BuildQyr.asp?s1=noise%2A&f1=%2A&s2=&PageNo=295&RecNo=2946&View=f&

NIOSHTIC-2 Search Results - Full ViewNIOSHTIC-2 Search Results - Full View

Auditory threshold; Hypoxia; Cochlea; Rat ... Noise exposure; Carbon monoxide; Ototoxicity; Auditory system; ... Repeated cyanide administration caused a persistent CAP threshold elevation despite the rapid recovery of EP and CAP observed ... little data are available concerning cyanides potential to disrupt auditory function. In this study, disruption of the ...
more infohttp://www2.cdc.gov/nioshtic-2/BuildQyr.asp?s1=noise%2A&f1=%2A&s2=&PageNo=141&RecNo=1404&View=f&
  • In humans and other mammals, the auditory system consists of the external, middle, and inner ears ( Figure 2-1 ), as well as the central auditory pathways in the brain. (nap.edu)
  • Repeated cyanide administration caused a persistent CAP threshold elevation despite the rapid recovery of EP and CAP observed following acute KCN administration. (cdc.gov)
  • The use of e-CAP threshold recordings for CI fitting raised the interest of clinicians in the past 2 decades [ 5 - 7 ]. (hindawi.com)
  • Although a number of studies have examined the effect of different anesthetics on evoked potential waveforms and growth functions, none have directly compared their effect on ABR hearing threshold estimates. (nih.gov)
  • Analysis of variance (ANOVA) of one factor in order to verify the interaction between the mean threshold and time after CI were used. (scielo.br)
  • We found significant interaction between time (F (3.140) = 91.973, p = 0.00) and the average hearing thresholds. (scielo.br)
  • To study such an interface, electrophysiological testing should provide a more accurate proxy of the interaction between the electrodes of the CI and the auditory neurons. (hindawi.com)
  • This suggests that the brain-s capacity to generate temporal predictions of sensory consequences can be decomposed into general temporal prediction capacities together with auditory-motor coupling. (duhnnae.com)