The audibility limit of discriminating sound intensity and pitch.
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.
Measurement of hearing based on the use of pure tones of various frequencies and intensities as auditory stimuli.
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 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.
The ability or act of sensing and transducing ACOUSTIC STIMULATION to the CENTRAL NERVOUS SYSTEM. It is also called audition.
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.
A genus, commonly called budgerigars, in the family PSITTACIDAE. In the United States they are considered one of the five species of PARAKEETS.
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.
Any sound which is unwanted or interferes with HEARING other sounds.
A general term for the complete or partial loss of the ability to hear from one or both ears.
Use of sound to elicit a response in the nervous system.
The minimum amount of stimulus energy necessary to elicit a sensory response.
The smallest difference which can be discriminated between two stimuli or one which is barely above the threshold.
Amount of stimulation required before the sensation of pain is experienced.

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)

The auditory threshold is the minimum sound intensity or loudness level that a person can detect 50% of the time, for a given tone frequency. It is typically measured in decibels (dB) and represents the quietest sound that a person can hear. The auditory threshold can be affected by various factors such as age, exposure to noise, and certain medical conditions. Hearing tests, such as pure-tone audiometry, are used to measure an individual's auditory thresholds for different frequencies.

Audiometry is the testing of a person's ability to hear different sounds, pitches, or frequencies. It is typically conducted using an audiometer, a device that emits tones at varying volumes and frequencies. The person being tested wears headphones and indicates when they can hear the tone by pressing a button or raising their hand.

There are two main types of audiometry: pure-tone audiometry and speech audiometry. Pure-tone audiometry measures a person's ability to hear different frequencies at varying volumes, while speech audiometry measures a person's ability to understand spoken words at different volumes and in the presence of background noise.

The results of an audiometry test are typically plotted on an audiogram, which shows the quietest sounds that a person can hear at different frequencies. This information can be used to diagnose hearing loss, determine its cause, and develop a treatment plan.

Pure-tone audiometry is a hearing test that measures a person's ability to hear different sounds, pitches, or frequencies. During the test, pure tones are presented to the patient through headphones or ear inserts, and the patient is asked to indicate each time they hear the sound by raising their hand, pressing a button, or responding verbally.

The softest sound that the person can hear at each frequency is recorded as the hearing threshold, and a graph called an audiogram is created to show the results. The audiogram provides information about the type and degree of hearing loss in each ear. Pure-tone audiometry is a standard hearing test used to diagnose and monitor hearing disorders.

Cochlear diseases refer to conditions that affect the structure or function of the cochlea, which is a part of the inner ear responsible for hearing. These diseases can cause various types and degrees of hearing loss, ranging from mild to profound. Some common cochlear diseases include:

1. Cochlear otosclerosis: A condition where there is abnormal bone growth in the cochlea, which can lead to conductive or sensorineural hearing loss.
2. Cochlear Meniere's disease: A disorder that affects the inner ear and causes vertigo, tinnitus, and fluctuating hearing loss.
3. Cochlear damage due to exposure to loud noises: Prolonged or sudden exposure to loud noises can cause permanent cochlear damage and hearing loss.
4. Presbycusis: Age-related hearing loss that affects the cochlea and other structures of the auditory system.
5. Cochlear nerve tumors: Rare benign or malignant growths on the cochlear nerve can cause hearing loss, tinnitus, and balance problems.
6. Infections: Bacterial or viral infections such as meningitis, labyrinthitis, or otitis media can damage the cochlea and lead to hearing loss.
7. Ototoxicity: Certain medications can be toxic to the cochlea and cause hearing loss, tinnitus, or balance problems.
8. Genetic factors: Inherited genetic mutations can cause various types of cochlear diseases, such as connexin 26 deficiency, Waardenburg syndrome, or Usher syndrome.

It is important to note that early diagnosis and treatment of cochlear diseases can help prevent or minimize hearing loss and other complications.

Noise-induced hearing loss (NIHL) is a type of sensorineural hearing loss that occurs due to exposure to harmful levels of noise. The damage can be caused by a one-time exposure to an extremely loud sound or by continuous exposure to lower level sounds over time. NIHL can affect people of all ages and can cause permanent damage to the hair cells in the cochlea, leading to hearing loss, tinnitus (ringing in the ears), and difficulty understanding speech in noisy environments. Prevention measures include avoiding excessive noise exposure, wearing hearing protection, and taking regular breaks from noisy activities.

Hearing is the ability to perceive sounds by detecting vibrations in the air or other mediums and translating them into nerve impulses that are sent to the brain for interpretation. In medical terms, hearing is defined as the sense of sound perception, which is mediated by the ear and interpreted by the brain. It involves a complex series of processes, including the conduction of sound waves through the outer ear to the eardrum, the vibration of the middle ear bones, and the movement of fluid in the inner ear, which stimulates hair cells to send electrical signals to the auditory nerve and ultimately to the brain. Hearing allows us to communicate with others, appreciate music and sounds, and detect danger or important events in our environment.

Auditory brainstem evoked potentials (ABEPs or BAEPs) are medical tests that measure the electrical activity in the auditory pathway of the brain in response to sound stimulation. The test involves placing electrodes on the scalp and recording the tiny electrical signals generated by the nerve cells in the brainstem as they respond to clicks or tone bursts presented through earphones.

The resulting waveform is analyzed for latency (the time it takes for the signal to travel from the ear to the brain) and amplitude (the strength of the signal). Abnormalities in the waveform can indicate damage to the auditory nerve or brainstem, and are often used in the diagnosis of various neurological conditions such as multiple sclerosis, acoustic neuroma, and brainstem tumors.

The test is non-invasive, painless, and takes only a few minutes to perform. It provides valuable information about the functioning of the auditory pathway and can help guide treatment decisions for patients with hearing or balance disorders.

"Melopsittacus" is the genus name for the species of bird commonly known as the Budgerigar or Parakeet. It is the only species in its genus and belongs to the Psittacidae family, which includes parrots. The Melopsittacus undulatus is a small, long-tailed parrot native to Australia, known for its bright green, yellow, or blue feathers and sociable behavior. They are popular pets due to their ease of care, playful personalities, and ability to mimic human speech.

The cochlea is a part of the inner ear that is responsible for hearing. It is a spiral-shaped structure that looks like a snail shell and is filled with fluid. The cochlea contains hair cells, which are specialized sensory cells that convert sound vibrations into electrical signals that are sent to the brain.

The cochlea has three main parts: the vestibular canal, the tympanic canal, and the cochlear duct. Sound waves enter the inner ear and cause the fluid in the cochlea to move, which in turn causes the hair cells to bend. This bending motion stimulates the hair cells to generate electrical signals that are sent to the brain via the auditory nerve.

The brain then interprets these signals as sound, allowing us to hear and understand speech, music, and other sounds in our environment. Damage to the hair cells or other structures in the cochlea can lead to hearing loss or deafness.

In the context of medicine, particularly in audiology and otolaryngology (ear, nose, and throat specialty), "noise" is defined as unwanted or disturbing sound in the environment that can interfere with communication, rest, sleep, or cognitive tasks. It can also refer to sounds that are harmful to hearing, such as loud machinery noises or music, which can cause noise-induced hearing loss if exposure is prolonged or at high enough levels.

In some medical contexts, "noise" may also refer to non-specific signals or interfering factors in diagnostic tests and measurements that can make it difficult to interpret results accurately.

Hearing loss is a partial or total inability to hear sounds in one or both ears. It can occur due to damage to the structures of the ear, including the outer ear, middle ear, inner ear, or nerve pathways that transmit sound to the brain. The degree of hearing loss can vary from mild (difficulty hearing soft sounds) to severe (inability to hear even loud sounds). Hearing loss can be temporary or permanent and may be caused by factors such as exposure to loud noises, genetics, aging, infections, trauma, or certain medical conditions. It is important to note that hearing loss can have significant impacts on a person's communication abilities, social interactions, and overall quality of life.

Acoustic stimulation refers to the use of sound waves or vibrations to elicit a response in an individual, typically for the purpose of assessing or treating hearing, balance, or neurological disorders. In a medical context, acoustic stimulation may involve presenting pure tones, speech sounds, or other types of auditory signals through headphones, speakers, or specialized devices such as bone conduction transducers.

The response to acoustic stimulation can be measured using various techniques, including electrophysiological tests like auditory brainstem responses (ABRs) or otoacoustic emissions (OAEs), behavioral observations, or functional imaging methods like fMRI. Acoustic stimulation is also used in therapeutic settings, such as auditory training programs for hearing impairment or vestibular rehabilitation for balance disorders.

It's important to note that acoustic stimulation should be administered under the guidance of a qualified healthcare professional to ensure safety and effectiveness.

Sensory thresholds are the minimum levels of stimulation that are required to produce a sensation in an individual, as determined through psychophysical testing. These tests measure the point at which a person can just barely detect the presence of a stimulus, such as a sound, light, touch, or smell.

There are two types of sensory thresholds: absolute and difference. Absolute threshold is the minimum level of intensity required to detect a stimulus 50% of the time. Difference threshold, also known as just noticeable difference (JND), is the smallest change in intensity that can be detected between two stimuli.

Sensory thresholds can vary between individuals and are influenced by factors such as age, attention, motivation, and expectations. They are often used in clinical settings to assess sensory function and diagnose conditions such as hearing or vision loss.

The Differential Threshold, also known as the Just Noticeable Difference (JND), is the minimum change in a stimulus that can be detected or perceived as different from another stimulus by an average human observer. It is a fundamental concept in psychophysics, which deals with the relationship between physical stimuli and the sensations and perceptions they produce.

The differential threshold is typically measured using methods such as the method of limits or the method of constant stimuli, in which the intensity of a stimulus is gradually increased or decreased until the observer can reliably detect a difference. The difference between the original stimulus and the barely detectable difference is then taken as the differential threshold.

The differential threshold can vary depending on a number of factors, including the type of stimulus (e.g., visual, auditory, tactile), the intensity of the original stimulus, the observer's attention and expectations, and individual differences in sensory sensitivity. Understanding the differential threshold is important for many applications, such as designing sensory aids for people with hearing or vision impairments, optimizing the design of multimedia systems, and developing more effective methods for detecting subtle changes in physiological signals.

Pain threshold is a term used in medicine and research to describe the point at which a stimulus begins to be perceived as painful. It is an individual's subjective response and can vary from person to person based on factors such as their pain tolerance, mood, expectations, and cultural background.

The pain threshold is typically determined through a series of tests where gradually increasing levels of stimuli are applied until the individual reports feeling pain. This is often used in research settings to study pain perception and analgesic efficacy. However, it's important to note that the pain threshold should not be confused with pain tolerance, which refers to the maximum level of pain a person can endure.

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, ...
Hirsh IJ, Bilger RC, Burns W (1955). "Auditory-Threshold Recovery after Exposures to Pure Tones". The Journal of the Acoustical ... Temporary threshold shifts can result in different types of fatigue. Recovery from temporary threshold shifts take a matter of ... Auditory fatigue Loudness war Brondel, L.; Cabanac, M. (2007). "Alliesthesia in visual and auditory sensations from ... Threshold shifts that result in long-term fatigue are dependent on level of sound and length of exposure. The temperature and ...
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 ...
... 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 - ...
Rechtschaffen A; Hauri P; Zeitlin M (June 1966). "Auditory awakening thresholds in REM and NREM sleep stages". Perceptual and ... However, the arousal thresholds have been shown to be higher during SWS causing infants to be less easily awakened. In human ... 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 ...
"Residual inhibition functions overlap tinnitus spectra and the region of auditory threshold shift". Journal of the Association ... Medicine portal Auditory hallucination - Form of hallucination that involves perceiving sounds without auditory stimulus Health ... Short-term auditory illusion Levine, Robert A.; Oron, Yahav (2015). "Tinnitus". The Human Auditory System - Fundamental ... When it is caused by disorders of the inner ear or auditory nerve, it can be called "otic" (from the Greek word for ear). These ...
An experimenter would generally use an audiometer to find the auditory threshold of a subject. The data received from an ... In experiments, human participants often respond to visual, auditory or other stimuli, following instructions given by an ... Much of Fechner's research focused on the measurement of psychophysical thresholds and just-noticeable differences. He invented ...
... such low spark energy is often below the threshold of human visual and auditory perception. Typical ignition energies are: ...
1995) evaluated whether dolphins have the ability of metacognitive monitoring in an auditory threshold paradigm. A bottlenosed ...
Frequencies above approximately 15 kilohertz cannot be perceived by many people anymore (see auditory threshold); therefore, ... and Adam von Fulda on the threshold of the early modern period in the 15th century. As an opponent of the Pythagorean ...
"A comparison of pure tone auditory thresholds in human infants and adults". Infant Behavior and Development. 6 (1): 3-17. doi: ... Otoacoustic emissions testing and/or Auditory Brainstem Response testing can provide further insight into the child's auditory ... As the auditory stimulus is presented, the child will naturally search for the sound source, resulting in a head turn and ... Using VRA, an audiologist can obtain minimal hearing thresholds ranging in frequencies from 250 Hz - 8000 Hz using speakers, ...
Therefore, affected individuals can have auditory processing deficits while having normal hearing thresholds. The combination ... Extensive damage can also be inflicted upon the auditory system. The tympanic membrane (also known as the eardrum) may be ... Gallun, F (2012). "Implications of blast exposure for central auditory function: a review". Journal of Rehabilitation Research ... intensity of the pressure changes from the blast can cause injury to the blood vessels and neural pathways within the auditory ...
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 ... "Follow-up of latency and threshold shifts of auditory brainstem responses after single and interrupted acoustic trauma in ... Auditory fatigue can be explained by the relative activity of the active process at low-level stimulation (. Hamernik, Roger P ...
"Hair cell regeneration and recovery of auditory thresholds following aminoglycoside ototoxicity in Bengalese finches". Hearing ... She noted that different tones were processed over time in the auditory midbrain and found that this brain region is well- ... She looked at how single neurons and populations of neurons in the auditory midbrain encode song versus generic noise. She ... She also noted that these finches can regenerate auditory hair cells, which can restore hearing within eight weeks following ...
Patients with StPD may have a lower odor detection threshold, and can have impaired auditory or olfactory processing. It is ... August 2008). "Auditory processing abnormalities in schizotypal personality disorder: an fMRI experiment using tones of deviant ... April 2012). "Auditory steady state response in the schizophrenia, first-degree relatives, and schizotypal personality disorder ... Mannan MR, Hiramatsu KI, Hokama H, Ohta H (October 2001). "Abnormalities of auditory event-related potentials in students with ...
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". ...
"Repeated antenatal corticosteroid treatments adversely affect neural transmission time and auditory thresholds in laboratory ...
"Colony differences in auditory thresholds in the canary (Serinus canarius)", J. Acoust. Soc. Am., 78 (4): 1170-1176, doi: ... Possibly explaining their strong left lateralization, canaries of the waterschlager strain contain an inherited auditory defect ...
Gpx1 −/− mice showed up to 16 dB higher auditory brainstem response (ABR) thresholds than control mice. After 110 dB noise ...
Also, phase-locked neural activity reflected in the FFR has been successfully used to predict auditory thresholds. Currently, ... Moore EJ (1983). Bases of auditory brain-stem evoked responses. Grune & Stratton, Inc. Skoe, E; Kraus, N (June 2010). "Auditory ... Chertoff, ME; Hecox, KE (March 1990). "Auditory nonlinearities measured with auditory-evoked potentials". The Journal of the ... is an evoked potential generated by periodic or nearly-periodic auditory stimuli. Part of the auditory brainstem response (ABR ...
REAT technology measures the difference in auditory (hearing) thresholds without hearing protection (unoccluded) and with ... Most REAT systems use a subjective measure to determine auditory thresholds much like a hearing test where the subject ... with real-ear attenuation at threshold (REAT) as the established standard under ANSI/ASA S12.6. It is important to note that ...
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 ...
... 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 ... This can be explained by the auditory system having an auditory filter which is centered over the frequency of the tone. The ... the frequency selectivity of the auditory system can be tested. How effective the masker is at raising the threshold of the ...
Compound threshold shifts is a value that integrates both temporary and permanent shifts in auditory threshold, the latter ... The Auditory Hazard Assessment Algorithm for Humans (AHAAH), a one-dimensional electro-acoustic analog of the auditory system, ... to receive their hazard vulnerability in auditory risk units (ARU). This value can be converted to compound threshold shifts ... Combatants in every branch of the United States' military are at risk for auditory impairments from steady state or impulse ...
Subliminal advertising - visual or auditory information discerned below the threshold of conscious awareness, which is claimed ... Tomatis Method A type of auditory integration training devised by Alfred A. Tomatis and promoted, without supporting evidence, ...
Hearing range Auditory masking Auditory filters Absolute threshold of hearing Equal-loudness contours Pure tone Audiology Pure- ... 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. ...
6. Micro Sound particles on a time scale that extends down to the threshold of auditory perception (measured in thousandths of ...
... the perceived loudness increases over-proportionally with sound volume once the auditory threshold has been overcome. This can ... In contrast, the dynamic range of patients with SNHL is often narrowed by both an increase in the threshold of audibility and a ...
This demonstrates that auditory nerve fibers respond best, and hence have better thresholds at the fiber's characteristic ... These demonstrate the frequencies a fiber responds to, by showing threshold levels (dB SPL) of auditory nerve fibers as a ... or the auditory tracts of the brainstem. If higher levels of the auditory tract are affected this is known as central deafness ... The threshold sound pressure level is the level above which sound will be integrated into the average. The sample time (fast, ...
The absolute threshold of hearing (ATH), also known as the absolute hearing threshold or auditory threshold, is the minimum ... 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 ...
A single auditory event is perceived. A reflection arriving later than 1 ms after the direct sound increases the perceived ... For signals with a nearly constant amplitude, the echo threshold can be enhanced up to time differences of 1 to 2 seconds. A ... When a sound is followed by another sound separated by a sufficiently short time delay (below the listener's echo threshold), ... listeners perceive a single auditory event; its perceived spatial location is dominated by the location of the first-arriving ...
Measuring auditory discrimination thresholds in preschool children: An empirically based analysis. In: Auditory Perception and ... Measuring auditory discrimination thresholds in preschool children: An empirically based analysis. Auditory Perception and ... Measuring auditory discrimination thresholds in preschool children: An empirically based analysis. Auditory Perception and ... Measuring auditory discrimination thresholds in preschool children: An empirically based analysis, Auditory Perception and ...
Relationship between Auditory Thresholds, Central Spontaneous Activity, and Hair Cell Loss after Acoustic Trauma. In: Journal ... Relationship between Auditory Thresholds, Central Spontaneous Activity, and Hair Cell Loss after Acoustic Trauma. Journal of ... Relationship between Auditory Thresholds, Central Spontaneous Activity, and Hair Cell Loss after Acoustic Trauma. / Mulders, ... Mulders, W., Ding, D., Salvi, R., & Robertson, D. (2011). Relationship between Auditory Thresholds, Central Spontaneous ...
... automatic threshold seeking procedure the advantages of computer models of the human auditory system at threshold are ... The models consist of an hardware electronic simulation of the auditory threshold and a digital computer program simulation or ... Moss, John Kenneth (1975) Models of the auditory threshold. Doctoral thesis, University of Salford. ... A software simulation of the complete 2.I.F.C. automatic threshold seeking system, incorporating the threshold model, is then ...
... generated by mobile phones on an auditory threshold task was investigated. 168 participants performed the task while exposed to ... suggesting that acute exposure to RF EMFs does not affect performance in the order threshold task. ... Acoustic Stimulation, Adult, Auditory Cortex, Auditory Threshold, Dose-Response Relationship, Radiation, Electromagnetic Fields ... Effects of mobile phone electromagnetic fields on an auditory order threshold task. ...
... as cross-modal facilitation has been shown in pre-cueing studies using auditory stimuli prior to the onset of a visual target. ...
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, ...
Temporary auditory threshold shift, right ear. H93242. Temporary auditory threshold shift, left ear. ... Temporary auditory threshold shift, bilateral. H93249. Temporary auditory threshold shift, unspecified ear. ...
To investigate the role of TRPV4 in the cochlea, the hearing thresholds and effects of acoustic overexposure on the cochlea ... but those at 24 weeks revealed significantly higher thresholds by auditory brainstem response. The auditory threshold shift was ... To investigate the role of TRPV4 in the cochlea, the hearing thresholds and effects of acoustic overexposure on the cochlea ...
Speech processing for hearing-impaired listeners considering threshold elevation in the critical band with an expanded auditory ... Speech processing for hearing-impaired listeners considering threshold elevation in the critical band with an expanded auditory ... Speech processing for hearing-impaired listeners considering threshold elevation in the critical band with an expanded auditory ... Threshold elevation is assumed to occur due to an increase in frequency components that pass the auditory filter; an assumption ...
Auditory Threshold * Environmental Exposure / adverse effects* * Humans * Noise / adverse effects* * Personality * Power Plants ... Results: (1) Infrasound sound near wind turbines does not exceed audibility thresholds. (2) Epidemiological studies have shown ...
... it is a notoriously difficult subject in auditory psychophysical... , Find, read and cite all the research you need on ... auditory thresholds in three species of birds, as measured by the. auditory brainstem response (L). Journal of the Acoustical ... Goerdel-Leich, A., & Schwartzkopff, J. (1984). The auditory threshold. of the pigeon (Columba livia) by heart-rate conditioning ... Behavioral studies of auditory thresholds indicate that that some bird species (chickens and pigeons, but not budgerigars or ...
The average hearing thresholds for each hearing frequency serve as the reference values when determining auditory threshold in ... This is defined as the auditory threshold. Such measurements are routinely made in both the clinic and basic science laboratory ... the measured auditory threshold is equal to that of the average human hearing level. ... Auditory system: Peripheral nonlinearity and central additivity, as revealed in the human stapedius-muscle reflex. Proc Natl ...
Operant measures of auditory threshold in prelingually deaf children with cochlear implant Processos Básicos. Silva, Wagner R. ... Auditory thresholds of prelingually deaf children who received cochlear implants were evaluated for the electrical stimulation ... psychophysical paradigm in combination with the operant procedure might be useful for the evaluation of the auditory threshold ... The experimental design allowed reliable identification of individual thresholds. The results suggest that the ...
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 ...
... thresholds were higher in ASD on the auditory TOJ task, providing preliminary evidence for impairment in auditory temporal ... thresholds were higher in ASD on the auditory TOJ task, providing preliminary evidence for impairment in auditory temporal ... In the current study, unisensory temporal acuity was measured by determining individual thresholds on visual and auditory ... Whereas no differences in thresholds for the visual TOJ task were seen between children with ASD and TD, ...
30 kHz pip pip_30 minimum_threshold_30khz 1 genotypes Ontology terms mapped to this series MA:0002443 auditory system MP: ... auditory brainstem response (ABR) threshold, sound pressure level [dB] The following measures are members of this series: • 6 ... 12 kHz pip pip_12 minimum_threshold_12khz 1 genotypes • 18 kHz pip pip_18 minimum_threshold_18khz 1 genotypes • 24 kHz pip pip_ ... 0004738 abnormal auditory brainstem response MGI. VT:0000366 brainstem auditory evoked potential ...
1966) Auditory awakening thresholds in REM and NREM sleep stages. Percept Mot Skills 22:927-942, doi:10.2466/pms.1966.22.3.927 ... Arousal thresholds.. Arousal thresholds were tested with sequentially increasing vibration intensities from 0 to 1.2 g in 0.3 g ... B, Acute blue light activation of PACα increases arousal thresholds to levels similar to dunce1 mutants. Arousal thresholds ( ... A threshold was chosen that was +2 SD above the inactivity average for the whole trace (20 or 25 pixels for all flies; Fig. 1E, ...
Auditory thresholds aremildly increased across all test frequencies. Gene Ontology. (GO). Classifications ...
The threshold at which the pulses fuse into a tonal percept is called auditory flutter fusion or sometimes auditory flicker ... One perceptual issue is the auditory equivalent of the visual flicker fusion threshold. If regular impulse-like oscillations ... Vocal fry (previously) is an auditory tic associated, currently, with young women (although it is by no means a new phenomenon ...
Stop Making Noise! Auditory Sensitivity in Adults with an Autism Spectrum Disorder Diagnosis: Physiological Habituation and ... at a voxel threshold of p , 0.001 (Fig. 3a). Voxels that were located near V1 were also not considered, to prevent potential ...
Evaluation of supra-threshold hearing following an event of recreational acoustic exposure. Smits, B., Holtegaard, P., Jeong, C ... Effect of head-movment on sound-field auditory steady state response meansurement. Kaithali Narayanan, S., Laugesen, S., Zapata ...
Trimethyltin disrupts loudness recruitment and auditory threshold sensitivity in guinea pigs. Liu, Y., Fechter, L.D. ... Trimethyltin (TMT) impairs auditory thresholds within minutes of systemic administration [9].. *Two time intervals were ...
The LfU Bavaria lists the auditory thresholds in the above mentioned paper. It follows that the emitted noise level of 120 dB/Z ... This entry was posted in noise and tagged infra sound, study, threshold on 2014/11/03. by joachim-w. Post navigation. ← Sitting ... The perception below the threshold of hearing is officially denied.. The Bavarian State Office for Environmental writes on his ... from the LMU researchers is above the threshold of hearing. Even more interesting would be the research project to measure the ...
Sensory-thresholds; Hearing-threshold; Auditory-system; Hearing-impairment; Author Keywords: Auditory-evoked response; Forward ... The evoked response thresholds were remeasured about 30 days after the exposure. The forward masking functions were changed in ... This increase was particularly noted once the threshold shift exceeded 20dB. The possibility of a relationship between the ... The mean preexposure thresholds of the ten animals ranged from 3 decibels (dB) sound pressure level (SPL) at 0.5 kilohertz (kHz ...
keywords = "age-related hearing loss, Alzheimer{\textquoteright}s disease (AD), auditory thresholds, auditory-evoked brainstem ... Aging shifted auditory thresholds in the range between 2 and 50.4 kHz significantly by 12-27 dB. This mild presbyacusis, ... Aging shifted auditory thresholds in the range between 2 and 50.4 kHz significantly by 12-27 dB. This mild presbyacusis, ... Aging shifted auditory thresholds in the range between 2 and 50.4 kHz significantly by 12-27 dB. This mild presbyacusis, ...
Busby KA, Mercier L, Pivik RTOntogenetic variations in auditory arousal threshold during sleep. Psychophysiology311994182188 ... In general, children have a higher arousal threshold than adults; the younger the child, the higher the arousal threshold (38 ... Studies have shown that these patients have elevated arousal thresholds in response to hypercapnia (40) and increased upper ... Although infants can produce high inspiratory pressures, they tend to function close to the diaphragmatic fatigue threshold (15 ...
Loss of Hearing means permanent, irrecoverable and total deafness, as determined by a Physician, with an auditory threshold of ...
One way of measuring the hearing threshold is by examining the auditory brainstem response (ABR).. The problem with measuring ... One way of measuring the hearing threshold is by examining the auditory brainstem response (ABR).. The problem with measuring ... One way of measuring the hearing threshold is by examining the auditory brainstem response (ABR). The problem with measuring ... for a hearing aid to continuously adapt to a subjects hearing loss it has to be able to gauge the users hearing threshold. ...
  • The main source of the auditory evoked field is the auditory cortex and the association cortices. (
  • Progenitor cell therapy may also allow functional reorganization of the auditory pathways including primary auditory cortex (Heschl's gyrus). (
  • Auditory Perception and Cognition , 1 (3-4), 173-204. (
  • Gillen, N , Agus, T & Fosker, T 2019, ' Measuring auditory discrimination thresholds in preschool children: An empirically based analysis ', Auditory Perception and Cognition , vol. 1, no. 3-4, pp. 173-204. (
  • Therefore, we attempted here to remove from the speech signal the frequency components that are not related to speech perception, but are instead related to threshold elevation. (
  • The perception below the threshold of hearing is officially denied. (
  • Antje Ihlefeld, who now leads auditory perception research at Meta Reality Labs in Redmond, will be talking about research she has done to better understand how central nervous system function affects the perception of spatial sounds. (
  • Prior to joining Reality Labs at Meta as Tech Lead for Auditory Perception, she was the principal investigator in a federally funded lab that worked on restoring hearing in individuals with profound hearing loss, and a professor for biomedical engineering. (
  • The cultural, social or political phenomena questioned here are related to frequencies below or beyond the threshold of perception, to overlapping sound fields or to auditory distraction. (
  • Current approaches tend to rely on single-task sensory processing thresholds to gauge the amount of sensory information received at the auditory periphery. (
  • However, the estimation of reliable auditory discrimination thresholds is impeded by non-sensory limitations in young children that impact task performance. (
  • Reports of abnormal sensory function that span the visual, auditory, gustatory, and tactile domains reinforce the "multisensory" nature of sensory processing alterations in ASD (for review, see Rogers and Ozonoff, 2005 ), and emerging evidence suggests that abnormalities also extend to the selective integration of information across the different sensory modalities (i.e., multisensory integration - see Iarocci and McDonald, 2006 ). (
  • The environment that an animal inhabits offers a rich array of sensory information spanning visual, auditory, tactile, electrical and chemical modalities ( Stevens, 2013 ). (
  • This perspective motivated the search for abstract representations of emotions in the brain, shared across variations in stimulus type (face, body, voice) and sensory origin (visual, auditory). (
  • Individuals with DFNB9 deafness are profoundly deaf as they are deficient in the gene coding for otoferlin, a protein which is essential for transmitting sound information at the auditory sensory cell synapses. (
  • These currents may be involved in shaping the receptor potential, implying crucial importance for the properties of afferent auditory signals. (
  • We addressed the function of BK Ca by recording sound-induced responses of afferent auditory nerve (AN) fibers from mice with a targeted deletion of the pore-forming α-subunit of BK Ca ( BKα −/− ) and comparing these with voltage responses of current-clamped IHCs. (
  • Most chemicals that are known to affect the auditory system are also neurotoxic and/or nephrotoxic. (
  • The Brainstem Auditory Evoked Response (BAEP) is a complex response to externalstimulation that represents the neural electrophysiological activity of the auditory system at the level of the brainstem, mapping the synapses of the auditory pathways from the cochlear nerve, cochlear nucleus, superior olivary brainstem complex to the inferior colliculus-midbrain 1,2 . (
  • In some cases, these tests can help differentiate the effects of chemicals from the effects of noise, since chemicals might affect the more central portions of the auditory system (nerves or nuclei of the central nervous system, the pathways to the brain or in the brain itself). (
  • Auditory brainstem response is a response to external stimulation that represents the neural electrophysiological activity of the auditory system at the brainstem level. (
  • Two weeks after a 10-kHz pure tone acoustic trauma, a tight relationship was demonstrated between the frequency region of compound action potential threshold loss and frequency regions in the inferior colliculus showing hyperactivity. (
  • Interestingly, hair cell loss was not present in the frequency regions where elevated cochlear thresholds and central hyperactivity were measured, suggesting that subtle changes in hair cell or primary afferent neural function are sufficient for central hyperactivity to be triggered and maintained. (
  • The effect of acute exposure to radio frequency electromagnetic fields (RF EMF) generated by mobile phones on an auditory threshold task was investigated. (
  • Auditory thresholds indicated frequency sensitivity from 800 Hz to almost 50 kHz, covering the species tonal communication range with fundamentals from about 8 to 40 kHz. (
  • Totally 28 youth undergraduates (56 ears) with normal hearing were selected to conduct the pure tone threshold audiometry (PTA), and the air-conduction auditory threshold of each frequency was no more than 15 dBHL. (
  • 20 years of age) had, on an average, normal hearing thresholds in the frequency range from 500 to 8000 Hz. (
  • Bio: Antje Ihlefeld applies principles of auditory neuroscience towards immersive AR/VR technology. (
  • Acoustic trauma caused by exposure to a very loud sound increases spontaneous activity in central auditory structures such as the inferior colliculus. (
  • No significant effect of exposure to RF EMF was detected, suggesting that acute exposure to RF EMFs does not affect performance in the order threshold task. (
  • Study of intermittent noise effects on the hearing of chainsaw operators to describe the nature of intermittent high level noise conditions produced through routine use of this equipment, and to assess the potential hazard to hearing according to proposed limits for intermittent noise exposure and by evaluation of the post- exposure temporary threshold shifts (TTS) in the hearing of the workers. (
  • The evoked response thresholds were remeasured about 30 days after the exposure. (
  • In order to investigate acute effects of loud noise exposure on cochlear microcirculation and hearing function, we have established a new standardized animal model by using in vivo-fluorescence microscopy and auditory brainstem response. (
  • On the contralateral ear, hearing threshold was measured by auditory brainstem response after exposure of both ears to loud noise (106 dB SPL, 30 min). (
  • In contrast to control animals, cochlear blood flow was reduced by 44 % while the hearing threshold increased by 23 dB SPL at the end of the observation period (210 min) after loud noise exposure. (
  • Auditory thresholds were assessed by sound-evoked auditory brainstem response at 4, 8, and 16 kHz, prior to and 10 days following noise exposure. (
  • An auditory evoked field (AEF) is a form neural activity that is induced by an auditory stimulus and recorded via magnetoencephalography, which is an equivalent of auditory evoked potential (AEP) recorded by electroencephalography. (
  • The earliest cortical components of AEF is equivalent to the middle latency response (MLR) of the EEG evoked potential, called the middle latency auditory evoked field (MLAEF), which occurs at 30 to 50 ms after the stimulus onset. (
  • At 100 ms after stimulus onset occurs the most prominent response in the late latency range, the M100, which corresponds to the N1 peak of the auditory long latency response (ALR) potential. (
  • ECochG generally involves measurement of the stimulus-related cochlear potentials (as opposed to the resting potentials), and often includes measurement of the whole nerve or compound action potential (AP) of the auditory nerve. (
  • Thus, researchers using AEF often deals with the global responses of the whole brain at the cortical level while focusing on the role of the auditory pathway. (
  • Kuriki S, Nogai T, Hirata Y. Cortical sources of middle latency responses of auditory evoked magnetic field. (
  • Onitsuka T, Ninomiya H, Sato E, Yamamoto T, Tashiro N. Differential characteristics of the middle latency auditory evoked magnetic responses to interstimulus intervals. (
  • Adding separate R and C responses (middle tracing) enhances the cochlear Summating Potential (SP) and auditory nerve Action Potential (AP). (
  • Both of these auditory evoked potentials responses arise from generators in the thalamo-cortical region of the central auditory system and so you would associate them with objectively assessing thresholds in adults e.g. medico-legal or non-organic hearing loss, or in those with learning difficulties or other challenges that preclude behavioural threshold finding techniques. (
  • Van Maanen, A and Stappells, DR. (2005) Comparison of multiple auditory steady-state responses (80 versus 40 Hz) and slow cortical potentials for threshold estimation in hearing impaired adults. (
  • The technical capability of recording cochlear and auditory nerve potentials in humansled to a variety of clinical applications for ECochG. (
  • The peripheral segments of the cochlear and vestibular nerves join at the lateral part of the internal auditory canal (IAC) to form the vestibulocochlear nerve. (
  • The longer central fibers, also called the primary auditory fibers, form the cochlear nerve, and the shorter, peripheral fibers extend to the bases of the inner and outer hair cells. (
  • The vibrations are changed into nerve signals in the inner ear and are carried to the brain by the auditory nerve. (
  • Fluid and small hair in the inner ear stimulate the auditory nerve. (
  • Virtanen J, Ahveninen J, Ilmoniemi RJ, Näätänen R, Pekkonen E. Replicability of MEG and EEG measures of the auditory N1/N1m-response. (
  • TRPV4 knockout mice at age 8 weeks exhibited normal, but those at 24 weeks revealed significantly higher thresholds by auditory brainstem response. (
  • Measurements were made of the evoked response forward masking functions in the inferior colliculus of ten normal chinchillas before and after creating a noise induced permanent threshold shift (PTS). (
  • In order to examine auditory thresholds and hearing sensitivity during aging in the gray mouse lemur (Microcebus murinus), suggested to represent a model for early primate evolution and Alzheimer research, we applied brainstem-evoked response audiometry (BERA), traditionally used for screening hearing sensitivity in human babies. (
  • One way of measuring the hearing threshold is by examining the auditory brainstem response (ABR). (
  • Although available to the hearing scientist/clinician for over 50 years, ECochG's emergence as a clinical tool (as well as all other auditory evoked potentials) was rekindled in part by the discovery, application and popularity of the auditory brainstem response (ABR). (
  • 2006) A comparison of 40 Hz auditory steady-state response (ASSR) and cortical auditory evoked potential (CAEP) thresholds in awake adult subjects. (
  • Auditory brainstem response (ABR) test was used to measure the effect of apoVs treatment. (
  • The auditory threshold shift was significantly larger in the TRPV4 knockout than in the TRPV4+/+ mice 1 week after the acoustic overexposure of 128dB SPL. (
  • This increase was particularly noted once the threshold shift exceeded 20dB. (
  • Similarly, when the total hearing threshold shift reached + 20 dB SPL in control animals, there was almost no threshold shift subsequent to TNF-α-inhibition therapy. (
  • Acoustical stress and hearing sensitivity in fishes: does the linear threshold shift hypothesis hold water? (
  • Abstract: Elevation of the threshold of audibility occurs in hearing-impaired people, and these individuals have an expanded auditory filter (Glasberg and Moore, 1986). (
  • We will present a summary of the effect of hearing loss on auditory development, existing preclinical and clinical data on progenitor cell therapy, and its potential role in the (re)habilitation of non-genetic SNHL. (
  • Here we used computerized simulations of child-like and adult-like performance, as well as novel behavioural task modifications with 3 and 4 year old preschool children and adults, to investigate key parameters in the successful estimation of auditory discrimination thresholds in preschool-aged children. (
  • By carrying out an intracochlear injection of this gene in an adult DFNB9 mouse model, the scientists successfully restored auditory synapse function and hearing thresholds to a near-normal level. (
  • air- conduction audiometry measures hearing thresholds. (
  • The auditory condition was verified by visual examination of the external ear canal, pure tone audiometry, and tympanometry. (
  • Observations about tinnitus in patients with normal pure tone audiometry raise the question about the role of the peripheral auditory system for triggering tinnitus. (
  • The brain waves measured while the subject is meditating go through a signal processing procedure (quantitative EEG spectral analysis) and are returned as auditory signals according to the threshold condition of the neurofeedback protocol algorithm. (
  • These primary auditory fibers exit the modiolus through the internal meatus and enter the medulla oblongata. (
  • To investigate the role of TRPV4 in the cochlea, the hearing thresholds and effects of acoustic overexposure on the cochlea were examined in TRPV4 knockout mice. (
  • The rapid development of auditory physiology during the last decades provides a possibility to study very early changes of the physiological function and of the micromechanics of the cochlea. (
  • Other hearing tests such as word recognition or otoacoustic emission tests examine other auditory functions. (
  • Auditory thresholds aremildly increased across all test frequencies. (
  • The hearing thresholds were slightly elevated in a group of tinnitus patients of working age and still more elevated (above all in the high frequencies) in retired persons with tinnitus. (
  • It is actually 1 out 5 for 40 decibels or greater, since the article states in any of the frequencies and either 3 out of 5 at an auditory threshold greater than 26 decibels. (
  • To establish hearing loss, you must prove that your auditory threshold is 40 decibels or greater in any of the 5 different frequencies, 500, 1000, 2000, 3000, and 4000 Hertz. (
  • Additionally, If your auditory threshold is greater than 26 decibels in at least 3 of the 5 frequencies above, then your hearing loss is a disability. (
  • This article discusses the anatomy of the auditory pathway (see the following images), as well as a few physiologic considerations and clinical applications. (
  • Illustration of the auditory reflex pathway. (
  • Evoked activity Magnetoencephalography Auditory evoked potential Induced activity Ongoing activity Jacobson GP. (
  • Aim: To analyze the wave characteristics of brainstem evoked potential (BEP), observe normative BEP V wave latency-intensity function curve and changes of corresponding threshold, and provide the reference for the combined application of air-conduction and bone-conduction BEP in clinic. (
  • Auditory discrimination is an important perceptual skill that seems to develop substantially during early childhood and is predictive of key developmental outcomes like language ability. (
  • In Experiment 6, we further investigate the role played by attention on visual dominance by manipulating perceptual load in either the visual or the auditory modality. (
  • 1) Infrasound sound near wind turbines does not exceed audibility thresholds. (
  • Extending the duration of the acoustic trauma from 1 to 2 hours did not result in significant increases in final cochlear threshold loss, but did result in a further increase of spontaneous firing rates in the inferior colliculus. (
  • Magnetoencephalographic studies of auditory system function. (
  • The topic was plasticity of the human binaural auditory system. (
  • Michael now works for the University of Canterbury in Christchurch, New Zealand, exploring his research interests which include electrophysiological measurement of the central auditory system, and the development of clinical protocols and clinical techniques applied in areas such as paediatric audiology and vestibular assessment and management. (
  • The mean preexposure thresholds of the ten animals ranged from 3 decibels (dB) sound pressure level (SPL) at 0.5 kilohertz (kHz) to 24dB SPL at 16kHz. (
  • The auditory threshold measures your ability to hear, so if the quietest sound you hear at 500, 1000, 2000, 3000, and 4000 Hertz is 40 decibels or greater, then your hearing is a disability per VA claim. (
  • Although the domestic pigeon is commonly used in learning experiments, it is a notoriously difficult subject in auditory psychophysical experiments, even those in which it need only respond when it detects a sound. (
  • The Bavarian State Office for Environmental writes on his website: "The recent data indicate that health effects of infrasound occur until the hearing threshold - ie only sound in the audible range … The infrasound from wind turbines can neither be heard nor perceived differently by people. (
  • An additional type of sensorineural loss is termed auditory neuropathy spectrum disorder, when sound can be detected but the signal is not sent correctly to the brain. (
  • However, recommendations for a cochlear implant evaluation also should maintain flexibility and consider a child's skill progression (i.e., month-for-month progress in speech, language, and auditory development) and quality of life with appropriately fit hearing aids. (
  • 2003 Aug;114(8):1513-20 Yamada T, Nakamura A, Horibe K, Washimi Y, Bundo M, Kato T, Ito K, Kachi T, Sobue G. Asymmetrical enhancement of middle-latency auditory evoked fields with aging. (
  • Aging shifted auditory thresholds in the range between 2 and 50.4 kHz significantly by 12-27 dB. (
  • Aging raises this threshold. (
  • Sequential strategies and decision rules for the location of specific points on a psychometric function are introduced as the basis of the automatic threshold seeking method. (
  • In the current study, unisensory temporal acuity was measured by determining individual thresholds on visual and auditory temporal order judgment (TOJ) tasks, and multisensory temporal function was assessed through a cross-modal version of the TOJ task. (
  • Together, these findings suggest that by considering central auditory processing when developing audio quality metrics, we can gain a more comprehensive understanding of how to arrive at audio quality that is indistinguishable from reality. (
  • T-817MA significantly reduced threshold deficits and hair cell death. (
  • In this study we further investigated the relationship between cochlear compound action potential threshold loss, cochlear outer and inner hair cell loss, and central hyperactivity in inferior colliculus of guinea pigs. (
  • In order for a hearing aid to continuously adapt to a subject's hearing loss it has to be able to gauge the users hearing threshold. (
  • Permanent elevation of hearing threshold and loss of hair cells (HCs) are the main feature of NIHL [ 20 ], which are mostly due to reactive oxygen species (ROS) accumulation including free radicals superoxide (O 2 ·− ), hydroxyl radical and singlet oxygen. (
  • The test only measures the auditory threshold and no other hearing loss aspect. (
  • Middle ear effusions can produce mild-to-moderate levels of conductive hearing loss, although threshold testing may be normal. (
  • In Experiment 1, we show the Colavita effect in the simple speeded detection of line drawings and naturalistic sounds, whereas in Experiment 2 we demonstrate visual dominance when the task targets (auditory, visual, or bimodal combinations) are embedded among continuous streams of irrelevant distractors. (
  • Children with middle ear effusions may demonstrate problems with auditory processing despite normal thresholds. (
  • Whereas no differences in thresholds for the visual TOJ task were seen between children with ASD and TD, thresholds were higher in ASD on the auditory TOJ task, providing preliminary evidence for impairment in auditory temporal processing. (
  • The overall results provide recommendations for designing procedures to estimate thresholds in preschool or developmentally delayed children. (
  • demonstrated that M100 can be applied to estimate hearing threshold to a higher degree of accuracy. (
  • Even more interesting would be the research project to measure the reactions of the inner ear with noise levels below the threshold of hearing. (
  • The number of people with normal hearing thresholds seeking medical help for tinnitus and other hearing problems is increasing. (
  • To develop more comprehensive audio quality metrics, it is necessary to consider central auditory processing. (