The electric response of the cochlear hair cells to acoustic stimulation.
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.
Use of sound to elicit a response in the nervous system.
A surgical specialty concerned with the study and treatment of disorders of the ear, nose, and throat.
The small thick cartilage that forms the lower and posterior parts of the laryngeal wall.
The muscles of the PHARYNX are voluntary muscles arranged in two layers. The external circular layer consists of three constrictors (superior, middle, and inferior). The internal longitudinal layer consists of the palatopharyngeus, the salpingopharyngeus, and the stylopharyngeus. During swallowing, the outer layer constricts the pharyngeal wall and the inner layer elevates pharynx and LARYNX.
Pathological processes of the ear, the nose, and the throat, also known as the ENT diseases.
Surgery performed on the ear and its parts, the nose and nasal cavity, or the throat, including surgery of the adenoids, tonsils, pharynx, and trachea.
The largest cartilage of the larynx consisting of two laminae fusing anteriorly at an acute angle in the midline of the neck. The point of fusion forms a subcutaneous projection known as the Adam's apple.
The joint that occurs between facets of the interior and superior articular processes of adjacent VERTEBRAE.

Supporting cells contribute to control of hearing sensitivity. (1/77)

The mammalian hearing organ, the organ of Corti, was studied in an in vitro preparation of the guinea pig temporal bone. As in vivo, the hearing organ responded with an electrical potential, the cochlear microphonic potential, when stimulated with a test tone. After exposure to intense sound, the response to the test tone was reduced. The electrical response either recovered within 10-20 min or remained permanently reduced, thus corresponding to a temporary or sustained loss of sensitivity. Using laser scanning confocal microscopy, stimulus-induced changes of the cellular structure of the hearing organ were simultaneously studied. The cells in the organ were labeled with two fluorescent probes, a membrane dye and a cytoplasm dye, showing enzymatic activity in living cells. Confocal microscopy images were collected and compared before and after intense sound exposure. The results were as follows. (1) The organ of Corti could be divided into two different structural entities in terms of their susceptibility to damage: an inner, structurally stable region comprised of the inner hair cell with its supporting cells and the inner and outer pillar cells; and an outer region that exhibited dynamic structural changes and consisted of the outer hair cells and the third Deiters' cell with its attached Hensen's cells. (2) Exposure to intense sound caused the Deiters' cells and Hensen's cells to move in toward the center of the cochlear turn. (3) This event coincided with a reduced sensitivity to the test tone (i.e., reduced cochlear microphonic potential). (4) The displacement and sensitivity loss could be reversible. It is concluded that these observations have relevance for understanding the mechanisms behind hearing loss after noise exposure and that the supporting cells take an active part in protection against trauma during high-intensity sound exposure.  (+info)

The effects of tone exposure on the inner ear functions in the guinea pig: impact tone vs. steady state tone. (2/77)

The damage-risk criterion (DRC) for hearing supposes that sound exposure with equal energy implies equal risk for noise-induced hearing loss (NIHL). We measured cochlear microphonics (CM), compound action potential (CAP), endocochlear potential (EP) and K+ ion concentration in the scala media, to see if the same level of Leq24h (impact tone and steady state tone) induced the same physiological changes in the inner ear function or not. Regarding the equal energy principle (EEP), we also examined if the EEP is appropriate or not at exposure of moderate level tone. We also checked how the time interval between impact tones affects or not the inner ear functions at the same Leq24h tone exposure. Therefore we used exposure at 1 pulse/second or 1 pulse/3 seconds and steady state tone exposure at Leq24h=90, 85 and 80 dB. The results are the following. Both steady state and impact tone exposure causes change of the electrophysiological data. First, CM maximum output voltage after exposure to impact tone of 115 dB (Leq24h=90 dB) was lower than after exposure to a 8 kHz steady state tone of 90 dB. CAP threshold (below 10 microV) obtained after the 115 and 110 dB exposure of impact tone were 5-10 dB higher than that of steady state tone of 90 dB. The negative EP induced by impact tone exposures showed the same tendency as the CM experiments. Having more frequent pulses (1 pulse/second vs. to 1 pulse/3 seconds) showed more inhibition. The K+ concentration time course remained similar to the control when the Leq24h was low (80 dB). Impact tone exposure induced stronger effects to the inner ear at exposure of moderate level tone than that of steady state tone of Leq24h.  (+info)

Comparative study of effects of impact tone and steady state tone exposure: EP and concentration of K+ ion and Na+ ion. (3/77)

To test the adequacy of equal energy principle (EEP), guinea pigs were exposed to impact tone. The changes in electrophysiological data, namely endocochlear potential (EP) and the change in K+ ion and Na+ ion concentrations in the endolymph were investigated. The frequency of impact tone was 1 pulse/second or 1 pulse/3 seconds. The steady state tone had Leq24h = 100, 95, 90 or 85 dB, and impact tone had Leq24h = 95, 90 or 85 dB. The results are the following. Both steady state and impact tone exposure cause changes of electrophysiological data. The effects on the absolute value of negative EP induced by impact tone exposures were smaller than that of steady state tone of the same Leq. The rate of pulses was also an important factor for impact tone exposure. Impact tone exposure of 1 pulse/second caused smaller absolute value of negative EP than that of 1 pulse/3 seconds. The K+ ion concentration time course in the endolymph remained similar to the control (Exp. 1) only in Exp. 8 (85 dB; the lowest steady state noise exposure in our experiments), but no decrease in the K+ ion concentration was detected in the other experiments, suggesting an alteration in the K+ ion flow. The Na+ ion concentration time course was also influenced showing no increase in Na+ ion concentration compared to the control (Exp. 1c) and the lowest steady-state exposure experiment (Exp. 8c). Our experimental results suggest that both the K+ ion and Na+ ion movement are altered by tone exposure. We found also that the different types of noise exposure with the same Leq value does not exhibit the same changes. Leq24h is not an accurate damage risk criteria.  (+info)

A targeted deletion in alpha-tectorin reveals that the tectorial membrane is required for the gain and timing of cochlear feedback. (4/77)

alpha-tectorin is an extracellular matrix molecule of the inner ear. Mice homozygous for a targeted deletion in a-tectorin have tectorial membranes that are detached from the cochlear epithelium and lack all noncollagenous matrix, but the architecture of the organ of Corti is otherwise normal. The basilar membranes of wild-type and alpha-tectorin mutant mice are tuned, but the alpha-tectorin mutants are 35 dB less sensitive. Basilar membrane responses of wild-type mice exhibit a second resonance, indicating that the tectorial membrane provides an inertial mass against which outer hair cells can exert forces. Cochlear microphonics recorded in alpha-tectorin mutants differ in both phase and symmetry relative to those of wild-type mice. Thus, the tectorial membrane ensures that outer hair cells can effectively respond to basilar membrane motion and that feedback is delivered with the appropriate gain and timing required for amplification.  (+info)

KCNJ10 (Kir4.1) potassium channel knockout abolishes endocochlear potential. (5/77)

Stria vascularis of the cochlea generates the endocochlear potential and secretes K(+). K(+) is the main charge carrier and the endocochlear potential the main driving force for the sensory transduction that leads to hearing. Stria vascularis consists of two barriers, marginal cells that secrete potassium and basal cells that are coupled via gap junctions to intermediate cells. Mice lacking the KCNJ10 (Kir4.1) K(+) channel in strial intermediate cells did not generate an endocochlear potential. Endolymph volume and K(+) concentration ([K(+)]) were reduced. These studies establish that the KCNJ10 K(+) channel provides the molecular mechanism for generation of the endocochlear potential in concert with other transport pathways that establish the [K(+)] difference across the channel. KCNJ10 is also a limiting pathway for K(+) secretion.  (+info)

Loud sound-induced changes in cochlear mechanics. (6/77)

To investigate the inner ear response to intense sound and the mechanisms behind temporary threshold shifts, anesthetized guinea pigs were exposed to tones at 100-112 dB SPL. Basilar membrane vibration was measured using laser velocimetry, and the cochlear microphonic potential, compound action potential of the auditory nerve, and local electric AC potentials in the organ of Corti were used as additional indicators of cochlear function. After exposure to a 12-kHz intense tone, basilar membrane vibrations in response to probe tones at the characteristic frequency of the recording location (17 kHz) were transiently reduced. This reduction recovered over the course of 50 ms in most cases. Organ of Corti AC potentials were also reduced and recovered with a time course similar to the basilar membrane. When using a probe tone at either 1 or 4 kHz, organ of Corti AC potentials were unaffected by loud sound, indicating that transducer channels remained intact. In most experiments, both the basilar membrane and the cochlear microphonic response to the 12-kHz overstimulation was constant throughout the duration of the intense stimulus, despite a large loss of cochlear sensitivity. It is concluded that the reduction of basilar membrane velocity that followed loud sound was caused by changes in cochlear amplification and that the cochlear response to intense stimulation is determined by the passive mechanical properties of the inner ear structures.  (+info)

NompC TRP channel required for vertebrate sensory hair cell mechanotransduction. (7/77)

The senses of hearing and balance in vertebrates rely on the sensory hair cells (HCs) of the inner ear. The central element of the HC's transduction apparatus is a mechanically gated ion channel of unknown identity. Here we report that the zebrafish ortholog of Drosophila no mechanoreceptor potential C (nompC), which encodes a transient receptor potential (TRP) channel, is critical for HC mechanotransduction. In zebrafish larvae, nompC is selectively expressed in sensory HCs. Morpholino-mediated removal of nompC function eliminated transduction-dependent endocytosis and electrical responses in HCs, resulting in larval deafness and imbalance. These observations indicate that nompC encodes a vertebrate HC mechanotransduction channel.  (+info)

Stiffness of the gerbil basilar membrane: radial and longitudinal variations. (8/77)

Experimental data on the mechanical properties of the tissues of the mammalian cochlea are essential for understanding the frequency- and location-dependent motion patterns that result in response to incoming sound waves. Within the cochlea, sound-induced vibrations are transduced into neural activity by the organ of Corti, the gross motion of which is dependent on the motion of the underlying basilar membrane. In this study we present data on stiffness of the gerbil basilar membrane measured at multiple positions within a cochlear cross section and at multiple locations along the length of the cochlea. A basic analysis of these data using relatively simple models of cochlear mechanics reveals our most important result: the experimentally measured longitudinal stiffness gradient at the middle of the pectinate zone of the basilar membrane (4.43 dB/mm) can account for changes of best frequency along the length of the cochlea. Furthermore, our results indicate qualitative changes of stiffness-deflection curves as a function of radial position; in particular, there are differences in the rate of stiffness growth with increasing tissue deflection. Longitudinal coupling within the basilar membrane/organ of Corti complex is determined to have a space constant of 21 microm in the middle turn of the cochlea. The bulk of our data was obtained in the hemicochlea preparation, and we include a comparison of this set of data to data obtained in vivo.  (+info)

It has been estimated that over one third of subjects with AN are affected by peripheral neuropathies [6]. In addition, optic neuropathies and other CNS disorders have been found in association with AN (non-isolated AN, Table 1). In this group of subjects the hearing disorder is underlain by several genetic defects, all resulting in neuronal loss and demyelination in peripheral and/or cranial nerves, and the site of the lesion is invariably postsynaptic.. AN has been identified at relatively high frequency in patients affected by Charcot-Marie-Tooth (CMT) disease. The first gene associated with AN in this group was the myelin protein zero (MPZ) gene [24] encoding a protein included in the compact myelin that plays a crucial role in myelin formation and adhesion. A missense mutation in MPZ was identified in a family affected by dominant AN and demyelinating sensorimotor neuropathy [24]. Post-mortem examination carried out on one member of this family revealed preserved hair cells in the cochlea, ...
A decade-long figurehead of the Belgian experimental scene, Dirk Serries has never been one to rest on his laurels. Before his Drone project Fear Falls Burning returns fr
Assessments of CAP amplitude (Fig. 2) and intraaxonal dye diffusion (Fig. 3) show that direct application of PEG to crush-severed sciatic nerves usually (97% of all attempts) rapidly restores physiological and morphological continuity to at least some axons in the sciatic nerve. In fact, continuity may be restored to many proximal and distal axonal halves (with unknown specificity) since CAP amplitudes of PEG-fused nerves on average are 50 to 89% of CAP amplitudes of intact-control or sham-operated nerves. FF asymmetry scores (Fig. 4) provide quantitative assessment of hindlimb motor behavior and show significantly faster recovery of functional behavior associated with direct application of PEG to crush-severed sciatic nerves. This finding for FF asymmetry scores is consistent with our measures of physiological and morphological continuity.. Video observations of FF trials and of open field trials also show rapid behavioral improvement associated with direct application of PEG to crush-severed ...
http://www.nydailynews.com/news/national/earbud-increases-hidden-hearing-loss-risk-study-article-1.2230945 http://sciencedaily.com/releases/2014/05/140507142804.htm Researchers at Harvard Medical Schools Eaton Peabody Laboratory learned you can lose up to 90 percent of your cochlear nerve fibers from frequent earbud use. Now hear this: Earbud headphones, even at low volume, may be causing permanent damage to your hearing. For decades, scientists have looked, almost exclusively, at the loss of…
Many cephalopods have lines of ciliated cells on their head and arms. In the cuttlefish Sepia and the squid Lolliguncula, electrophysiological recordings clearly identify these epidermal lines as an...
A string instrument pickup system sensitive to 360 of transverse string movement, which is substantially immune from microphonics, and which has a substantially equal or balanced response to all of the strings. In one form of the invention a piezoelectric transducer is compressively associated with vertical movement components of each string of the instrument, but is laterally offset from a centered position under the string for compressive association of the transducer also with the horizontal string movement components; and halves of the total piezoelectric transducer area are oppositely polarized so as to cancel out microphonics. In a modular form of the invention a plurality of the piezoelectric transducers are supported in an elongated array by means of a flexible body of electrically insulative material and a pliable outer wrapping of metal foil so that the transducer is conformable to distortions and deformations in string saddle and bridge elements of the instrument between which the modular
Mice homozygous for the jerker spontaneous mutation (|i|Espn|sup|je|/sup||/i|) show behavior typical of the circling mutants - head-tossing, circling, and hyperactivity. Homozygous mutant mice are deaf from birth and have no detectable stimulus-related cochlear potential at any stage. The abnormal behavior and deafness are associated with postnatal degeneration of the sensory cells of the cochlea and the sacculus and utriculus in homozygotes. The primary influence of the jerker gene appears to be on the apical hair cells, not development of neural structures. Heterozygous jerker mice undergo a similar type of degeneration, but the onset is delayed. Auditory brainstem response is totally absent in homozygotes while heterozygous mice undergo a progressive impairment with age.|br||br|Flexed tail homozygotes can be identified hematologically as earlyas embryonic day 13 and are detectably paler than normal by embryonic day 16, with most paler than normal by embryonic day 15. Homozygotes are small at birth
Canton has recently introduced eight new loudspeakers in its Ergo line, including a new powered subwoofer and seven full-range models featuring new crossover. New models include a trio of three-way floorstanders, two bookshelf speakers, two 2-1/2-way center channel speakers, and a 200-Watt powered subwoofer, and all are available in silver lacquer, black, beech, and cherry wood veneer finishes. The new Ergo full-range models incorporate improved crossover networks that are based on technology developed for the companys signature Karat Reference 2 DC loudspeaker system. These changes include the use of ICW polypropylene capacitors, which have led to a marked reduction in dielectric absorption or memory effects giving the models improved transient response and detail. The new crossover design also has a significant reduction in microphonics designed to improve mid-range and high-frequency reproduction. The new Ergo center channel speakers are 2-1/2-way designs optimized for horizontal mounting. ...
This exquisite floral, vine and leaf pattern rug affords an exotic elegance to any area thanks to its mystical hues of white, gold, orange, olive, crimson, cerulean blue and chocolate brown. Sumptuous hand-carved embellishments lend a high impact tone and
Subject: biophysics of infrasound From: Eliot Handelman ,eliot(at)SUNRISE.CC.MCGILL.CA, Date: Thu, 27 Jan 1994 17:19:34 EST Greetings, Im trying to locate research on the biophysical effects of infrasound. A few years ago I collected a series of citations -- about 25? from JASA, primarily from the late 50s and early 60s. Princeton cataloged several of these but they were all missing. It turned out that these papers were reclassified during 80s, and my efforts to get them through the DoD met with no success, supposedly because Princeton did not wish to comply with Dods restricted materials protocol. Can anyone tell me what is so interesting about biophysical effects of infrasound that merits classification? Best, -- eliot ...
Cochlear-Internal Carotid Artery Dehiscence with a Pathologic Electrocochleography Dehiscences of labyrinthine structures are mainly defects of the semicircular canals. ..
Starting in 2011, infrasound sensors became a standard component and were installed at each new USArray Transportable Array (TA) site. Currently, with over 400 sensors, TA acts as a large infrasound array that continuously samples the wavefield of atmospheric acoustic sources. To support this new data set, the IRIS Data Management Center (DMC) has developed two infrasound data products: the TA Infrasound Reference Event Database (TAIRED) and TA Infrasound Detections (TAID). These two data products are designed to provide insight and tools for researchers to begin working with this large, and somewhat unique, new data set.. TAIRED (http://www.iris.edu/spud/infrasoundevent) is a user-supported evolving infrasound reference event depository where researchers can contribute to and find infrasound events for their research. This database currently holds 59 events including one meteorite, seven explosions, and 12 rocket launches. For each event, metadata, infrasound and seismic record sections, ...
The cochlear stria vascularis produces the positive endocochlear potential (EP) and the endolymph. Both the EP and the endolymph are essential for the physiological function of hair cells. The interme
Peripheral neural responses to cochlear stimulation via electrically evoked compound action potentials (ECAPs) of differing pulse distance and interphase gap
Fish possess two separate systems for detection of low-level sound and water motions in the low-frequency range: the inner ear and the lateral line. The relative roles of these systems in normal fish behaviour is still not clear. There is, for instance, a lack of experimental evidence showing the involvement of the lateral line and the inner ear in detection of infrasound, in directional hearing in the near field, and in detection and attack of swimming prey below the surface. To provide a useful tool for such studies, we have developed a pharmacological method for selective and reversible blocking of the lateral line in the roach (Rutilus rutilus). By recording multi-unit activity from the lateral line nerve and microphonic potentials from the inner ear, we have shown that cobalt ions in the external water may completely block the mechanosensitivity of the lateral line without affecting the utricular microphonic activity. This inhibiting effect of Co2+ is antagonized by Ca2+, making the ratio ...
Synonyms for Acoustic reflex in Free Thesaurus. Antonyms for Acoustic reflex. 26 synonyms for reflex: automatic, spontaneous, instinctive, involuntary, impulsive, knee-jerk, unthinking, automatic, impulsive, instinctive, involuntary.... What are synonyms for Acoustic reflex?
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Select-A-Strike clappers are adjustable by rotating the clapper screw slightly counter-clockwise until the clapper is free to rotate. Rotate the clapper to the desired position and retighten the screw.. Quick-Adjust clappers (See Fig. 3) are adjustable without loosening the clapper screw. In fact, the clapper screw should never be turned. This screw is locked to the clapper shaft by a special chemical bond between the screw and shaft. To adjust, rotate clapper until it clicks into the desired position. NOTE: DO NOT TAKE YOUR QUICK-ADJUST CLAPPER APART. THEY MUST BE RETURNED TO THE FACTORY FOR ANY REPAIRS NEEDED.. Try it! On all bells C8 and below in pitch, three decidedly different impact tones can be achieved. This permits a selection of mellow or more brilliant tones to be generated in your bells, according to your tonal preference. These options provide a soft mellow strike tone designated by the letter S imprinted on the clapper insert, a medium tone designated by M on the insert, and ...
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 ...
Definition of acoustic reflex threshold in the Financial Dictionary - by Free online English dictionary and encyclopedia. What is acoustic reflex threshold? Meaning of acoustic reflex threshold as a finance term. What does acoustic reflex threshold mean in finance?
TY - JOUR. T1 - Intracellular Potential Changes of Cortis Organ With Anoxia. AU - Nuttall, Alfred L.. AU - Lawrence, Merle. PY - 1979/10. Y1 - 1979/10. N2 - Intracellular measurements of the resting cell membrane potentials of guinea pig Cortis organ were made in order to determine the sensitivity of this cell potential to anoxic hypoxia (a lowered oxygen state due to lack of respiratory oxygen) and to establish differences according to cell types or morphologic regions of the sensory epithelium. The negative cell potentials measured from successful electrode penetrations were found to be relatively more stable and resistant to change during a 120-s period of anoxia than was the positive endocochlear potential. The intracellular resting potentials were also much slower to recover after resumption of respiration. Data obtained from various cells in two different regions of Cortis organ indicate that Cortis organ is receiving oxygen from both the perilymph and the endolymph. An iontophoretic ...
Auditory evoked potentials (AEP) are highly demanded during the whole process of equipping patients with cochlear implants (CI). They play an essential role in preoperative diagnostics, intraoperative testing, and postoperative monitoring of auditory performance and success. The versatility of AEPs is essentially enhanced by their property to be evokable by acoustic as well as electric stimuli. Thus, the electric responses of the auditory system following acoustic stimulation and recorded by the conventional surface technique as well as by transtympanic derivation from the promontory (Electrocochleography [ECochG]) are used for the quantitative determination of hearing loss and, additionally, electrically evoked compound actions potentials (ECAP) can be recorded with the intracochlear electrodes of the implant just adjacent to the stimulation electrode to check the functional integrity of the device and its coupling to the auditory system ...
The MS4630B is suitable for electronics production lines demanding fast and accurate device measurements. It is particularly well suited to accurate, high-speed evaluation of IF filter resonance and group delay characteristics, among others.
TY - JOUR. T1 - Physiological role of L-type Ca2+ channels in marginal cells in the stria vascularis of guinea pigs. AU - Inui, Takaki. AU - Mori, Yoshiaki. AU - Watanabe, Masahito. AU - Takamaki, Atsuko. AU - Yamaji, Junko. AU - Sohma, Yoshiro. AU - Yoshida, Ryotaro. AU - Takenaka, Hiroshi. AU - Kubota, Takahiro. N1 - Copyright: Copyright 2008 Elsevier B.V., All rights reserved.. PY - 2007/10. Y1 - 2007/10. N2 - Using immunohistochemical and electrophysiological methods, we investigated the role of L-type Ca2+ channels in the regulation of the endocochlear potential (EP) of the endolymphatic surface cells (ESC) of the guinea pig stria vascularis. The following findings were made: (1) Administration of 30 μg/ml nifedipine via a vertebral artery significantly suppressed the transient asphyxia-induced decrease in the EP (TAID) and the transient asphyxia-induced increase in the Ca2+, referred to as TAIICa, concentration in the endolymph ([Ca]e).(2) The endolymphatic administration of 1 μg/ml ...
A feverish quest exists to uncover the events that lead to cochlear amplification in mammals. The role of the OHC is certainly paramount, and we now have identified many componentsthat form the basis of the cells unique contribution. In my mind, a few observations leadthe story on this hot topic, including the molecular identification of the OHC motor, its modulation by anions and the demonstration of the motors anion transport capabilities. Here I review some of this recent work.. ...
Offered inÂ- 10-67 GHz models, R&S ZVAX-TRM conditions signals from R&S ZVA network analyzers and returns them to analyzer or outputs them via integrated test ports. Users can measure parameters such as compression, noise figure, and group delay, even on 3-port T/R modules, with DUT having to be connected only once. When combined with 4-port analyzer with 4 internal sources,... Read More » ...
Hand Tools, including DEWALT - 23-Piece 1/2 Drive Combination Socket Set DWMT73813, Wilton - 746 Mechanics Vice, DEWALT - Compound Action..
Plants to 1.5 cm high, in hoary green to gray-green cushions, opaque-green to nearly black below. Leaves loosely imbricate when dry, loosely erect-spreading when moist, somewhat concave but not at all keeled, to 3 mm long with the awn constituting nearly 1/2 of that length, ovate-lanceolate from a loosely sheathing somewhat expanded base, 2.5-3.5: 1. Median leaf cells in regular longitudinal rows, unistratose in the expanded base but uniformly bistratose in the limb, smooth, to 7 µm wide, isodiametric with lumens irregular but without corner thickenings. Marginal cells not differentiated. Basal juxtacostal cells elliptical, to 3: 1, to 15 µm wide, with irregularly thickened lateral walls. Basal marginal cells transversely elongate, 0.5-0.7: 1, to 15 µm wide. Costa flared at the base and filling 1/3-1/4 of immediate leaf base, narrowed and obscure above, percurrent in the somewhat acuminate awn. Costa cross-section at leaf middle broad and flattened, less than 1.5 times as thick as the ...
I just started to use VNA. After I done a full insertable 2 port calibration with SMA cable. I measured group delay with port 1 and port 2 reference plane
Fingerprint Dive into the research topics of Porosity controls spread of excitation in tectorial membrane traveling waves. Together they form a unique fingerprint. ...
Although outer hair cells (OHCs) play a key role in cochlear amplification, it is not fully understood how they amplify sound signals by more than 100 fold. Two competing or possibly complementary mechanisms, stereocilia-based and somatic electromotility-based amplification, have been considered. Lacking knowledge about the exceptionally rich protein networks in the OHC plasma membrane, as well as related protein-protein interactions, limits our understanding of cochlear function. Therefore, we focused on finding protein partners for two important membrane proteins: Cadherin 23 (cdh23) and prestin. Cdh23 is one of the tip-link proteins involved in transducer function, a key component of mechanoelectrical transduction and stereocilia-based amplification. Prestin is a basolateral membrane protein responsible for OHC somatic electromotility. Using the membrane-based yeast two-hybrid system to screen a newly built cDNA library made predominantly from OHCs, we identified two completely different groups of
18 yrs old Female asked about Auditory neuropathy, 1 doctor answered this and 67 people found it useful. Get your query answered 24*7 only on | Practo Consult
Impaired stria vascularis integrity upon loss of E cadherin in basal cells is an eagle-i resource of type Journal article at eagle-i Network Shared Resource Repository.
Grant finansowany przez: The J. William Fulbright Foreign Scholarship Board & The U.S. Department of State Nr P008/00 (2000-2001) - Kierownik Projektu i Główny Wykonawca Identifying in an Animal Model Criteria for the Intraoperative Monitoring of Cochlear Function During Neuro-Otologic Surgery in Patients with Cerebello-Pontine Angle Tumors Using Otoacoustic Emissions ...
Following publication of the original article (Naud and Longtin in J Math Neurosci 9:3, 2019), the authors noticed a mistake in the first paragraph within
Chinchilla Corner is reader-supported, if you purchase any products through the links below we may receive a small commission. Learn more What do chinchillas eat? If you are considering adopting a chinchilla, you might find yourself asking this question. It is important to know what to feed your new furry…
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differences in human TM waves relative to those of other mammals.. TM wave properties were measured in samples taken from human cadavers ...
Can. J. Bot. 44: 609. 1966. -- Merceya latifoia Kindb. in Mac., Bull. Torr. Bot. Club 16: 94. 1889. -- Scopelophila latifolia (Kindb.) Ren. & Card., Rev. Bryol. 19: 92. 1892. Plants in thick turfs or as scattered tufts to 2.5 cm high, dark-green mostly with a reddish-brown cast. Leaves in a comose apical cluster, spreading when moist but keeled along costa and loosely reflexed near margins when dry, obovate to spatulate, 3.5-4.5 mm long, about 2.5: 1. Median laminal cells pluripapillose with low and inconspicuous punctiform papillae, to 16 µm broad, in straight rows radiating from costa to leaf margin, with lumen/wall ratio 4-8: 1, quadrate to hexagonal with angular lumens and without corner thickenings. Basal juxtacostal cells rectangular with straight and thin lateral walls, to 30 µm broad, 2-5: 1, smooth. Marginal cells abruptly larger than median cells, about twice as deep as wide, mostly reddish pigmented, less papillose and thicker-walled than adjacent laminal cells. Basal marginal cells ...
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Looking for online definition of Auditory Neuropathy, Autosomal Dominant 1 in the Medical Dictionary? Auditory Neuropathy, Autosomal Dominant 1 explanation free. What is Auditory Neuropathy, Autosomal Dominant 1? Meaning of Auditory Neuropathy, Autosomal Dominant 1 medical term. What does Auditory Neuropathy, Autosomal Dominant 1 mean?
Auditory neuropathy is diagnosed when person has normal OAE reading but absent or abnormal Auditory Br ainstem Response. Therefore from OAE and ABR results indicated that hair cell of cochlear is intact but the transmission of auditory nerve to brain is impaired.. Treatment and intervention for auditory neuropathy. There are a few treatment and intervention options for Auditory Neuropathy. However the potential benefit of treatment and intervention are vary to individual.. Frequency modulation (FM) systems. Some professionals reported frequency modulation (FM) systems are helpful for auditory neuropathy with normal hearing. Frequency modulation (FM) system is a device that can transmit sound directly to the listener by sound wave. By using FM system, the listener could concentrate to the speech better and would be useful especially in noisy environment.. ...
INTRODUCTION: the aim of this study was to investigate cochlear functions in patients with hyperemesis gravidarum (HG). METHODES: twenty-nine HG patients (58 ears) and 31 healthy control subjects (62 ears) were included. Audiometry testings at 250 and 500 Hz and 1, 2, 4, 8, 10, 12, 14, 16 kHz were performed to the patients and controls. RESULTS: mean age of patients with HG was 26,5 4,4 years and the mean age of control group was 28,0 4,2 years. At the time of the tests mean gestational age of the HG group and controls were 9 and 11 weeks respectively. No differences were observed between the groups in tympanic membrane status, orother otolaringological evaluations. No significant differences were observed in audiometric tests at any frequencies between the groups (p values for all>0.05). CONCLUSION: there was not a difference between pregnant cases with HG and cases with normal pregnancy in terms of audimetric tests. Cochlear functions are not affectedremarkably in women with HG.
Randomized, double-blind, placebo-controlled safety, pharmacokinetic, pharmacodynamic study of oral SPI-1005 in adults with Menieres disease. All subjects will undergo baseline audiometric testing and have their severity of sensorineural hearing loss, tinnitus and vertigo determined before the start of a 21-day course of treatment with SPI-1005 or placebo. During treatment with SPI-1005, and 7 days and 28 days following the cessation of SPI-1005, subjects will have their hearing loss, tinnitus and vertigo assessed. Additional testing including electrocochleography will be performed at baseline, at the end of SPI-1005 treatment, and 28 days after the SPI-1005 treatment has stopped. Six outpatient visits will be performed over a 7-week period ...
Learn more about Auditory Neuropathy at TriStar Southern Hills DefinitionCausesRisk FactorsSymptomsDiagnosisTreatmentPreventionrevision ...
Learn more about Auditory Neuropathy at Doctors Hospital of Augusta DefinitionCausesRisk FactorsSymptomsDiagnosisTreatmentPreventionrevision ...
Mechanical responses in the basal turn of the guinea-pig cochlea are measured with low-level broad-band noise as the acoustical stimulus [for details see de Boer and Nuttall, J. Acoust. Soc. Am. 101, 3583-3592 (1997)]. Results are interpreted within the framework of a classical three-dimensional model of the cochlea that belongs to a very wide class of nonlinear models. The use of linear-systems analysis for this class of nonlinear models has been justified earlier [de Boer, Audit. Neurosci. 3, 377-388 (1997)]. The data are subjected to inverse analysis with the aim to recover the effective basilar-membrane impedance. This is a parameter function that, when inserted into the model, produces a model response, the resynthesized response, that is similar to the measured response. With present-day solution methods, resynthesis leads back to an almost perfect replica of the original response in the spatial domain. It is demonstrated in this paper that this also applies to the response in the frequency
(article taken from empresschinchilla.com) Chinchilla, A Cellulose-Splitter Rodent Wendell Bird In the chinchillas native habitat, in which it has lived for many thousands of years, this animal has existed with a minimum of rainfall and other sources of water and has been able to thrive on relatively low protein fibers, dried grasses in a realtively…
This phenomenon came to be known as the cochlear microphonic (CM). The FFR may have been accidentally discovered back in 1930; ... In 1930, Wever and Bray discovered a potential called the "Wever-Bray effect". They originally believed that the potential ... FFRs have the potential to be used to evaluate the neural representation of speech sounds processed by different strategies ... originated from the cochlear nerve, but it was later discovered that the response is non-neural and is cochlear in origin, ...
... cochlear microphonic potentials MeSH G11.561.250.370.300 - evoked potentials, auditory, brain stem MeSH G11.561.250.385 - ... evoked potentials, motor MeSH G11.561.250.400 - evoked potentials, somatosensory MeSH G11.561.250.425 - evoked potentials, ... event-related potentials, p300 MeSH G11.561.250.370 - evoked potentials, auditory MeSH G11.561.250.370.223 - ... visual MeSH G11.561.250.440 - excitatory postsynaptic potentials MeSH G11.561.450.100 - action potentials MeSH G11.561.450.100. ...
... cochlear microphonic potentials MeSH G07.453.450.370.300 - evoked potentials, auditory, brain stem MeSH G07.453.450.385 - ... evoked potentials, motor MeSH G07.453.450.400 - evoked potentials, somatosensory MeSH G07.453.450.425 - evoked potentials, ... evoked potentials MeSH G07.453.450.250 - contingent negative variation MeSH G07.453.450.350 - event-related potentials, p300 ... membrane potentials MeSH G07.453.697.100 - action potentials MeSH G07.453.697.100.570 - myoelectric complex, migrating MeSH ...
Cochlear microphonic (CM) Summating potential (SP) Action potential (AP) As described above, the cochlear microphonic (CM) is ... A resting endolymphatic potential of a normal cochlea is + 80 mV. There are at least 3 other potentials generated upon cochlear ... 1954). "Exploration of cochlear potentials in guinea pigs with a micro-electrode". Journal of the Acoustical Society of America ... This measurable AC voltage is called the cochlear microphonic (CM), which mimics the stimulus. The hair cells function as a ...
Absence of cochlear microphonic potentials indicates hair cell dysfunction as a cause for noted hearing impairment. ... often with positive recruitment suggestive of a cochlear site of lesion. A Mondini cochlear malformation and enlarged ... The Outcomes of Cochlear Implantation in Usher Syndrome: A Systematic Review. J Clin Med. 2021 Jun 29. 10 (13):[QxMD MEDLINE ... Cochlear Implantation in Patients With Usher Syndrome Type IIa Increases Performance and Quality of Life. Otol Neurotol. 2017 ...
Interactions with noise on cochlear potentials, namely compound action potential (CAP) and cochlear microphonic (CM) were ...
Interactions with noise on cochlear potentials, namely compound action potential (CAP) and cochlear microphonic (CM) were ...
Cochlear microphonic Phenomenon in which a waveform falling on the ear is replicated by graded potentials from the outer hair ... Refractory period Time immediately following an action potential, during which a nerve cell returns to its resting potential. ... Depolarization Process in which a neuron changes from its resting potential to a less negative potential. ... Hyperpolarization Process in which a neuron changes from its resting potential to a more negative potential. ...
... the cochlear microphonic (CM), summating potential (SP), and compound action potential (AP). Both CM and SP signals are ... click summating potential/action potential ratio measurements and tone burst summating potential measurements," Acta Oto- ... R. B. Patuzzi, G. K. Yates, and B. M. Johnstone, "The origin of the low-frequency microphonic in the first cochlear turn of ... H. Asai and N. Mori, "Change in the summating potential and action potential during the fluctuation of hearing in Ménières ...
Cochlear Microphonic Potentials G7.265.500.370.223 G7.265.216.500.370.223 G11.561.270.370.223 G11.561.200.500.370.223 Codeine ... Event-Related Potentials, P300 G7.265.500.350 G7.265.216.500.350 G11.561.270.350 G11.561.200.500.350 Evoked Potentials G7.265. ... Evoked Potentials, Motor G7.265.500.385 G7.265.216.500.385 G11.561.270.385 G11.561.200.500.385 Evoked Potentials, Somatosensory ... Membrane Potential, Mitochondrial G3.495.335.770.500 G3.295.770.500 G7.265.750.550 G7.265.675.550 Membrane Potentials G7.265. ...
Cochlear microphonic potential (CM) was recorded from the CF2 region and the sparsely innervated zone (the mustached bats ... Sound-evoked electrical potentials from cochlear duct. The electrical signal recorded from the cochlear duct in Pteronotus ... of the total population of the cochlea and OHC responses to the 61 kHz signal dominate the cochlear microphonic potential (CM) ... In four cases, the bats were brought to a laboratory in Havana and kept 1-3 d before the measurement of cochlear potentials. To ...
Henson OW, Pollak GD, Kobler JB, Henson MM, Goldman LJ (1982) Cochlear microphonic potentials elicited by biosonar signals in ... Suga N (1969b) Echo-location and evoked potentials of bats after ablation of inferior colliculus. J Physiol 203:707-728. pmid: ... Lewicki MS (1998) A review of methods for spike sorting: the detection and classification of neural action potentials. Network ... Alternating gray scales visualize which action potentials were evoked by which call-echo element. B, Neuronal response from a ...
Cochlear Microphonic Potentials Entry term(s). Cochlear Microphonic Potential Potential, Cochlear Microphonic Potentials, ... Cochlear Microphonic Potential. Potential, Cochlear Microphonic. Potentials, Cochlear Microphonic. Tree number(s):. G07.265. ... Cochlear Microphonic Potentials - Preferred Concept UI. M0004687. Scope note. The electric response of the cochlear hair cells ... 91; was see under EVOKED POTENTIALS, AUDITORY 1980-90. History Note:. 91(80); was see under EVOKED POTENTIALS, AUDITORY 1980-90 ...
耳蜗内电位 endochochlear potential 耳蜗微音器电位cochlear microphonic potential 二氧化碳解离曲线carbon dioxide dissociation curve F 发汗 sweating, ... 微音器电位 microphonic potential 微终板电位 miniature endplate potential, MEPP 胃肠激素 gastrointestinal hormones 胃排空 gastric emptying 胃蠕动 ... 诱发电位 evoked potential 阈刺激 threshold stimulus 阈下刺激 subthreshold stimulus 阈电位 threshold potential 阈值 threshold 原发性主动转运primary ... 膜电
Selective destruction of IHCs has no effect on the cochlear microphonic (CM) potential and distortion product otoacoustic ... cochlear function and auditory evoked potentials. Noise & Health. 2000 ; 2(6): 9-26. ... A review of the effects of selective inner hair cell lesions on distortion product otoacoustic emissions, cochlear function and ...
... the cochlear microphonic (CM) potential and distortion product otoacoustic emissions (DPOAEs) remain normal, indicating that ... The alteration endocochlear potential (EP) in response to total cochlear ischemia induced by various experimental manipulations ... Effect of focal cochlear vascular lesion on endocochlear potential in guinea pigs. ... The immune response is an important component of the cochlear response to stress. As an important player in the cochlear immune ...
How to Record the Cochlear Microphonic (CM) Level: Introductory. Learn more. Most Popular in Anatomy / Physiology and Pathology ... physiology and pathology of evoked potentials testing. ...
Cochlear Microphonic Potentials G7.265.500.370.223 G7.265.216.500.370.223 G11.561.270.370.223 G11.561.200.500.370.223 Codeine ... Event-Related Potentials, P300 G7.265.500.350 G7.265.216.500.350 G11.561.270.350 G11.561.200.500.350 Evoked Potentials G7.265. ... Evoked Potentials, Motor G7.265.500.385 G7.265.216.500.385 G11.561.270.385 G11.561.200.500.385 Evoked Potentials, Somatosensory ... Membrane Potential, Mitochondrial G3.495.335.770.500 G3.295.770.500 G7.265.750.550 G7.265.675.550 Membrane Potentials G7.265. ...
Cochlear Microphonic Potentials G7.265.500.370.223 G7.265.216.500.370.223 G11.561.270.370.223 G11.561.200.500.370.223 Codeine ... Event-Related Potentials, P300 G7.265.500.350 G7.265.216.500.350 G11.561.270.350 G11.561.200.500.350 Evoked Potentials G7.265. ... Evoked Potentials, Motor G7.265.500.385 G7.265.216.500.385 G11.561.270.385 G11.561.200.500.385 Evoked Potentials, Somatosensory ... Membrane Potential, Mitochondrial G3.495.335.770.500 G3.295.770.500 G7.265.750.550 G7.265.675.550 Membrane Potentials G7.265. ...
Cochlear Microphonic Potentials G7.265.500.370.223 G7.265.216.500.370.223 G11.561.270.370.223 G11.561.200.500.370.223 Codeine ... Event-Related Potentials, P300 G7.265.500.350 G7.265.216.500.350 G11.561.270.350 G11.561.200.500.350 Evoked Potentials G7.265. ... Evoked Potentials, Motor G7.265.500.385 G7.265.216.500.385 G11.561.270.385 G11.561.200.500.385 Evoked Potentials, Somatosensory ... Membrane Potential, Mitochondrial G3.495.335.770.500 G3.295.770.500 G7.265.750.550 G7.265.675.550 Membrane Potentials G7.265. ...
Cochlear Microphonic Potentials G7.265.500.370.223 G7.265.216.500.370.223 G11.561.270.370.223 G11.561.200.500.370.223 Codeine ... Event-Related Potentials, P300 G7.265.500.350 G7.265.216.500.350 G11.561.270.350 G11.561.200.500.350 Evoked Potentials G7.265. ... Evoked Potentials, Motor G7.265.500.385 G7.265.216.500.385 G11.561.270.385 G11.561.200.500.385 Evoked Potentials, Somatosensory ... Membrane Potential, Mitochondrial G3.495.335.770.500 G3.295.770.500 G7.265.750.550 G7.265.675.550 Membrane Potentials G7.265. ...
Cochlear function. Despite massive IHC and ANF damage, otoacoustic emissions and the cochlear microphonic potential generated ... Therefore, the summating potential and compound action potential (analogous to ABR wave I) can be used to assess the functional ... However, the amplitude of the summating potential generated by the IHC and the amplitude of the compound action potential ... When measurements are made from a single auditory nerve fiber connected to a cochlear region where 60 to 90 percent of the IHC/ ...
... summating potential, and action potential. The cochlear microphonic and summating potential reflect cochlear bioelectric ... The two action potentials generated by the cochlear nerve may be attributed to the change from Schwanns cell endoneurium ... The ratio of the summating potential to the action potential (SP/AP) is calculated and reported as a percentage. Normal ranges ... The three major components of the ECochG are the cochlear microphonic, ...
This phenomenon came to be known as the cochlear microphonic (CM). The FFR may have been accidentally discovered back in 1930; ... They originally believed that the potential originated from the cochlear nerve, but it was later discovered that the response ... a b c Burkard, R., Don, M., & Eggermont, J. J. Auditory evoked potentials: Basic principles and clinical application. ... The frequency following response (FFR), also referred to as frequency following potential (FFP) or envelope following response ...
It was shown in animals that the Cochlear drive (ΔP) estimates hearing as seen the graph, where the Cochlear Microphonic in ... Jaime presented work that helps to demonstrate the potential paths of communication to the brain following cochlear damage. In ... Thus, the differential pressure is the cochlear input drive with the formula: PSV− PST = ΔP (Cochlear Input Drive). ... Auditory nociception is defined as the detection of cochlear damage (such as that caused by intense or persistent noise) by ...
Travel Time in the Cochlea and Its Determination from Cochlear-Microphonic Data. Dallos, P. & Cheatham, M. A., Jan 1 1971, In: ... TRB3: An oxidant stress-induced pseudokinase with a potential to negatively modulate MCP-1 cytokine in diabetic nephropathy. ...
Effects of stimulus intensity on low-frequency toneburst cochlear microphonic waveforms Ming Zhang. ... Sensitivity of cortical auditory evoked potential detection for hearing-impaired infants in response to short speech sounds ... Experiences with bimodal hearing and bilateral cochlear implantation in the elderly E.M. Schedlbauer,R. G?tze,S. Scholz,I. Todt ... Indication criteria for cochlear implants and hearing aids: impact of audiological and non-audiological findings Sabine Haumann ...
Some observations on cochlear potentials and nerve action potentials in children. Ruben, R. J., Lieberman, A. T. & Bordley, J. ... Clinical studies on microphonic potentials and functional currents of the human cochlea.. RUBEN, R. J., BORDLEY, J. E., NAGER, ... The VIIIth nerve action potential in menieres disease. Ruben, R. J. & Walker, A. E., Nov 1963, In: Laryngoscope. 73, 11, p. ... Properties of the Eighth Nerve Action Potential. Ruben, R. T., Fiscay, U. & Hudson, W., Jan 1962, In: Journal of the Acoustical ...
An auditory evoked-potential-recording system (SmartEP, Intelligent Hearing Systems (IHS), Miami, FL, USA) was used to record ... Hopkins, K., and Moore, B. C. (2007). Moderate cochlear hearing loss leads to a reduced ability to use temporal fine structure ... Worden, F. G., and Marsh, J. T. (1968). Frequency-following (microphonic-like) neural responses evoked by sound. ... Füllgrabe, C., Meyer, B., and Lorenzi, C. (2003). Effect of cochlear damage on the detection of complex temporal envelopes. ...
... and failure to change the stimulus polarity for clicks in a pediatric test to assess the cochlear microphonic. In other words, ... The potential for damage to outer, middle, and even inner ear structures increases when we take deep canal ear impressions. ... If you do not notify your carrier that there was a potential incident within 30 days, they can refuse to pay if it becomes ... When we place the otoscope within the ear, use a bracing technique to avoid potential injury to the canal wall or to the ...
These are the first μOCT images of mammalian cochlear anatomy, and they demonstrate μOCTs potential utility as an imaging tool ... efferent stimulation had much less effect on the phase of the cochlear microphonic (CM) than on ANF phase. Thus, since CM is ... TNF-α perfusion did not significantly change thresholds for compound action potential (CAP) responses, which reflect cochlear ... Detailed cochlear histopathology in meningioma has not been reported.Retrospective analysis of cochlear histopathology in five ...
  • IMSEAR at SEARO: A review of the effects of selective inner hair cell lesions on distortion product otoacoustic emissions, cochlear function and auditory evoked potentials. (who.int)
  • Selective destruction of IHCs has no effect on the cochlear microphonic (CM) potential and distortion product otoacoustic emissions (DPOAEs). (who.int)
  • Despite massive IHC and ANF damage, otoacoustic emissions and the cochlear microphonic potential generated by the OHC remain normal, indicating that OHC are functioning normally. (riversidehearingaids.com)
  • Interactions with noise on cochlear potentials, namely compound action potential (CAP) and cochlear microphonic (CM) were studied. (cdc.gov)
  • The action potential is an AC potential that represents the compound action potential of the fiber's eighth nerve that discharges synchronously in response to a stimulus. (medscape.com)
  • However, the amplitude of the summating potential generated by the IHC and the amplitude of the compound action potential generated by ANF are reduced in proportion to the amount of IHC loss. (riversidehearingaids.com)
  • Therefore, the summating potential and compound action potential (analogous to ABR wave I) can be used to assess the functional status of IHC and ANF in clinical cases of suspected hidden hearing loss. (riversidehearingaids.com)
  • When 50 percent of the IHC/ANF were destroyed, the compound action potential from the cochlea was reduced by 50 percent. (riversidehearingaids.com)
  • Cochlear microphonic potential (CM) was recorded from the CF2 region and the sparsely innervated zone (the mustached bat's cochlea fovea) that is specialized for analyzing the Doppler-shifted echoes of the first-harmonic (∼61 kHz) of the constant-frequency component of the echolocation call. (jneurosci.org)
  • To test this hypothesis, electrodes were chronically implanted at the level of the cochlea, inferior colliculus, and auditory cortex to record the local field potentials from these regions pre- and post-carboplatin. (riversidehearingaids.com)
  • One way to enhance weak cochlear signals from a damaged cochlea is to increase the gain of the central auditory pathway by removing GABAergic inhibition. (riversidehearingaids.com)
  • Thus, the central auditory pathway progressively amplifies weak cochlear signals as they are relayed up the central auditory pathway. (riversidehearingaids.com)
  • How is the central auditory pathway able to amplify these weak cochlear signals? (riversidehearingaids.com)
  • If the auditory system behaved as a simple linear system, neural responses recorded at higher auditory centers should be reduced by half, unless the brain possessed a neural amplification system that can boost these weak cochlear signals. (riversidehearingaids.com)
  • [6] [7] They originally believed that the potential originated from the cochlear nerve , but it was later discovered that the response is non-neural and is cochlear in origin, specifically from the outer hair cells . (wikipedia.org)
  • [1] FFRs have the potential to be used to evaluate the neural representation of speech sounds processed by different strategies employed by users of cochlear implants , primarily identification and discrimination of speech. (wikipedia.org)
  • Currently, there is renewed interest in using the FFR to evaluate: the role of neural phase-locking in encoding of complex sounds in normally hearing and hearing impaired subjects, encoding of voice pitch, binaural hearing, and evaluating the characteristics of the neural version of cochlear nonlinearity. (wikipedia.org)
  • CM measured during the ongoing tone and in the ringing after tone offset is 50 dB more sensitive, is sharply tuned, has compressive level functions, and the phase leads onset CM by 90°: an indication that cochlear responses are amplified during maximum basilar membrane velocity. (jneurosci.org)
  • The frequency responses of the CM recorded from the cochlear fovea can be accounted for through synchronization between the nonlinear oscillators responsible for the cochlear resonance and the stimulus tone. (jneurosci.org)
  • Here, we investigate the functional role of Toll-like receptor 4 (Tlr4), a cellular receptor that activates the innate immune system, in the regulation of cochlear responses to acoustic overstimulation. (bvsalud.org)
  • When measurements are made from a single auditory nerve fiber connected to a cochlear region where 60 to 90 percent of the IHC/ANF are missing, only a few ANF are still available from which to obtain measurements. (riversidehearingaids.com)
  • Waves I and II are addition, in the computer some characteristics that generated in the cochlear nerve and subsequent define certain acquisition parameters record the 1 Speech-Language Therapist. (bvsalud.org)
  • The electric response of the cochlear hair cells to acoustic stimulation. (bvsalud.org)
  • We demonstrate that Tlr4 knockout does not affect sensory cell viability under physiological conditions, but reduces the level of sensory cell damage and cochlear dysfunction after acoustic injury. (bvsalud.org)
  • Together, these findings suggest that Tlr4 promotes sensory cell degeneration and cochlear dysfunction after acoustic injury. (bvsalud.org)
  • The frequency following response ( FFR ), also referred to as frequency following potential ( FFP ) or envelope following response ( EFR ), is an evoked potential generated by periodic or nearly-periodic auditory stimuli. (wikipedia.org)
  • We investigated 20 students from a Center for Diagnosis and Rehabilitation, with no hearing impairment, all female aged 15-30 years old, who were screened for brainstem auditory evoked potential, which presented stimuli in different polarities ranges, including condensation and rarefaction in different presentation rates of 21.7, 27.7 and 47.7 stimuli per second. (bvsalud.org)
  • The cochlear microphonic is a stimulus-related alternating current (AC) potential that closely mimics the stimulus and therefore is difficult to separate from stimulus artifact. (medscape.com)
  • The summating potential (SP) is a stimulus-related direct current (DC) potential that reflects the time-related displacement of the cochlear partition. (medscape.com)
  • For tones within 2 kHz of the cochlear resonance the frequency of CM measured within 2 msec of tone onset is not that of the stimulus but is proportional to it. (jneurosci.org)
  • For tones just below the cochlear resonance region CM frequency is a constant amount below that of the stimulus depending on CM measurement delay from tone onset. (jneurosci.org)
  • Fewer signals need to be averaged to obtain an interpretable response, and the potentials are much longer than in other methods of ECoG. (medscape.com)
  • Action potentials Short bursts of electrical activity such as those generated by the ganglion cells. (skidmore.edu)
  • The initial portion of the action potential also is known as wave I of the ABR. (medscape.com)
  • Surprisingly, the remaining acoustically responsive ANF behave normally (with low thresholds and sharp tuning) despite massive cochlear damage. (riversidehearingaids.com)
  • ECoG is a method of measuring intracochlear electrical potential changes associated with hearing. (medscape.com)
  • Temporal analysis of the CM, which is tuned sharply to the 61 kHz cochlear resonance, revealed that at the resonance frequency, and within 1 msec of tone onset, CM is broadly tuned with linear magnitude level functions. (jneurosci.org)
  • Rapid disruption of cochlear function and structure by trimethyltin in the guinea pig. (nih.gov)
  • Acute disruption of cochlear potentials by potassium cyanide. (cdc.gov)
  • Only one ear with cochlear nerve deficiency had present otoacoustic emissions as measured by distortion-product otoacoustic emissions. (nih.gov)
  • Auditory neuropathy spectrum disorder is characterized by normal outer hair cell function (present otoacoustic emissions [OAE] and/or cochlear microphonic), suggesting that the hearing loss results from abnormal inner hair cells, synapses, or auditory nerve function that can be demonstrated with an absent or abnormal auditory brain stem response (ABR) test. (nih.gov)
  • Although individual responses to cochlear implants are highly variable and depend on a number of physical and psychosocial factors, the trend toward improved performance with increasingly sophisticated electrodes and programming strategies has dramatically expanded indications for cochlear implantation. (medscape.com)
  • Because preoperative expectations affect the patient's postoperative satisfaction and use of the implant, all patients and families require attention and counseling from an implant team before they embark on the life-changing journey of cochlear implantation. (medscape.com)
  • The HINT measures word-recognition abilities to evaluate the patient's candidacy for cochlear implantation, in conjunction with conventional pure-tone and speech audiometry. (medscape.com)
  • What is another word for cochlear implantation ? (synonyms.com)
  • This thesaurus page is about all possible synonyms, equivalent, same meaning and similar words for the term cochlear implantation . (synonyms.com)
  • We couldn't find direct synonyms for the term cochlear implantation . (synonyms.com)
  • or search for cochlear implantation inside other dictionary definitions. (synonyms.com)
  • Are we missing a good synonym for cochlear implantation ? (synonyms.com)
  • To describe a group of children exhibiting electrophysiologic responses characteristic of auditory neuropathy (AN) who were subsequently identified as having absent or small cochlear nerves (i.e., cochlear nerve deficiency). (nih.gov)
  • OBJECTIVE: To evaluate the relationship between cognitive performance and long-latency auditory evoked potentials in an elderly population. (scielo.org)
  • The screening procedures adopted were an inspection of the external auditory canal, tonal and vocal audiometry, tympanometry, brain stem auditory evoked potential, the Montreal Cognitive Assessment test, and long-latency auditory evoked potential. (scielo.org)
  • We investigated 20 students from a Center for Diagnosis and Rehabilitation, with no hearing impairment, all female aged 15-30 years old, who were screened for brainstem auditory evoked potential, which presented stimuli in different polarities ranges, including condensation and rarefaction in different presentation rates of 21.7, 27.7 and 47.7 stimuli per second. (bvsalud.org)
  • Demonstration of traveling waves in the guinea pig cochlea by recording cochlear microphonics. (nih.gov)
  • These seven waves, and the cochlear nucleus and between these the top five most interest and, among them, the pathways exists a series of parallel pathways7. (bvsalud.org)
  • Trimethyltin (TMT) is a potent ototoxicant which acutely disrupts generation of the action potential evoked by a broad range of tone frequencies and subsequently produces selective high frequency impairment and outer hair cell (OHC) damage in the extreme basal turn of the cochlea. (nih.gov)
  • Invention of the double-cannulation method of internal perfusion of the squid giant axon and analyses of the bi-ionic action potential. (nih.gov)
  • For patients with hearing loss that is not mitigated by hearing aids, a cochlear implant may provide an opportunity for hearing. (medscape.com)
  • Attention has not been given to an evaluation of individual study quality or to the strength of the overall evidence regarding potential adverse health effects. (nih.gov)
  • This review was intended to serve as an initial step in determining whether sufficient information is available to make a reasonable assessment of the potential for adverse human health effects to occur as a result of infrasound exposure. (nih.gov)
  • About 736,900 registered cochlear implant devices had, as of December 2019, been placed in patients worldwide. (medscape.com)
  • This study variability somewhat limits the conclusions that can be drawn regarding the potential to cause adverse health effects in humans without further expert evaluation and review. (nih.gov)
  • The cochlear implant is a surgically placed device that converts sound to an electrical signal. (medscape.com)
  • CONCLUSION: There is a relationship between long-latency potentials and cognitive performance in the elderly, which was observed by the increase in the P2 amplitude and the impairment of the process of sound decoding. (scielo.org)