Summary
Physiological recordings were made of the compound action potential from the round window and single neurons in the cochlear ganglion of normal adult chickens (Gallus domesticus). The compound action potential threshold to tone bursts decreased from approximately 42 dB at 0.25 kHz to 30 dB between 1 and 2 kHz and then increased to 51 dB at 4 kHz. Most of the cochlear ganglion cells had characteristic frequencies below 2 kHz and the thresholds of most neurons were roughly 30–35 dB lower than the compound action potential thresholds. At any given characteristic frequency, thresholds varied by as much as 60 dB and units with the highest thresholds tended to have the lowest spontaneous rates. Spontaneous discharge rates ranged from 0 to 200 spikes/s with a mean rate of 86 spikes/s. Interspike interval histograms of spontaneous activity often contained regular peaks with the time interval between peaks approximately equal to 1/(characteristic frequency). Tuning curves were sharply tuned and V-shaped with approximately equal slopes to the curves above and below characteristic frequency. Q10dB and Q30dB values for the tuning curves increased with characteristic frequency. Post stimulus time histograms showed sustained firing during the stimulus and were characterized by a slight-to-moderate peak at stimulus onset. Most units showed vigorous phase-locking to tones at characteristic frequency although the degree of phase-locking declined sharply with increasing characteristic frequency. Discharge rate-level functions at characteristic frequency had a mean dynamic range of 42 dB and a mean saturation firing rate of 327 spikes/s. In general, the firing patterns of cochlear ganglion neurons are similar in most respects to those reported in other avians, but differ in several important respects from those seen in mammals.
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Abbreviations
- CF :
-
characteristic frequency
- CAP :
-
compound action potential
References
Békésy G von (1960) Experiments in hearing. McGraw-Hill, New York, pp 504–506
Corwin JT, Cotanche DA (1988) Regeneration of sensory hair cells after acoustic trauma. Science 240:1772–1774
Crawford AC, Fettiplace RR (1980) The frequency selectivity of auditory nerve fibers and hair cells in the cochlea of the turtle. J Physiol 306:79–125
Dallos P, Harris DM, Ozdamar O, Ryan A (1978) Behavioral, compound action potential and single unit thresholds: relationship in normal and abnormal ears. J Acoust Soc Am 64:151–157
Düring M von, Andres KH, Simon K (1985) The comparative anatomy of the basilar papillae in birds. Fortschr Zool 30:681–685
Fermin CD, Cohen GM (1984) Developmental gradients in the embryonic chick's basilar papilla. Acta Otolaryngol (Stockh) 97:39–51
Fuchs PA, Nagai T, Evans MG (1988) Electrical tuning in hair cells isolated from the chick cochlea. J Neurosci 8:2460–2467
Geisler CD (1981) A model for discharge patterns of primary auditory-nerve fibers. Brain Res 212:198–201
Goldberg JM, Brown PB (1969) Response of binaural neurons of dog superior olivary complex to dichotic tonal stimuli: some physiological mechanisms of sound localization. J Neurophysiol 32:613–636
Gray L (1990) Development of temporal integration in newborn chickens. Hearing Res 45:169–178
Gray L, Rubel EW (1985a) Development of absolute thresholds in chickens. J Acoust Soc Am 77:1162–1172
Gray L, Rubel EW (1985b) Development of auditory thresholds and frequency difference limens in chickens. In: Gottlieb G, Drasnegor NA (eds) Measurement of audition and vision in the first year of postnatal life: a methodological overview. Ablex, Norwood, pp 145–165
Jhavari S, Morest DK (1982) Neural architecture in nucleus magnocellularis of chicken auditory system with observations on nucleus laminaris: a light and electron microscope study. Neurosci 7:809–836
Kettner RE, Feng J-Z, Brugge JF (1985) Postnatal development of phase-locking response to low frequency tones of auditory nerve fibers in cat. J Neurosci 5:275–283
Klinke R, Pause M (1980) Discharge properties of primary auditory fibers in Caiman crocodilus; comparisons and contrasts to the mammalian auditory nerve. Exp Brain Res 38:137–150
Liberman MC (1978) Auditory-nerve response from cats raised in a low-noise chamber. J Acoust Soc Am 63:442–455
Liberman MC (1980) Morphological differences among radial afferent fibers in the cat cochlea: an electron-microscopic study of serial sections. Hearing Res 3:45–63
Liberman MC (1988) Physiology of cochlear efferent and afferent neurons: direct comparisons in the same animal. Hearing Res 34:179–192
Manley GA (1979) Preferred intervals in the spontaneous activity of primary auditory neurones. Naturwissenschaften 66:582
Manley GA, Robertson D (1976) Analysis of spontaneous activity of auditory neurones in the spiral ganglion of the guinea-pig cochlea. J Physiol 258:323–336
Manley GA, Gleich O, Leppelsack H-J, Oeckinghaus H (1985) Activity patterns of cochlear ganglion neurones in the starling. J Comp Physiol A 157:161–181
Manley GA, Brix J, Kaiser A (1987) Developmental stability of the tonotopic organization of the chick's basilar papilla. Science 237:655–656
McFadden EA, Saunders JC (1989) Recovery of function following intense sound exposure in the neonatal chick. Hearing Res 41:205–215
Murrow BW, Fuchs PA (1989) Electrical membrane properties of short hair cells from the chick's cochlea. Abstr Assoc Res Otolaryngol, St. Petersburg, Florida, Feb. 5–9, 136
Patuzzi RB, Bull CL (1991) Electrical responses from the chicken basilar papilla. Hearing Res 53:57–77
Rhode WS, Smith PH (1986) Encoding timing and intensity in the ventral cochlear nucleus of the cat. J Neurophysiol 56:261–286
Rubel EW, Parks TN (1975) Organization and development of brain stem auditory nuclei of the chicken: Tonotopic organization of N. magnocellularis and N. laminaris. J Comp Neurol 164:411–434
Rubel EW, Lippe WR, Ryals BM (1984) Development of the place principle. Ann Otol Rhinol Laryngol 93:609–615
Ryals BM, Rubel EW (1987) Hair cell regeneration after acoustic trauma in adult Coturnix Quail. Science 240:1774–1776
Sachs MB, Young ED, Lewis RH (1974) Discharge patterns of single fibers in the pigeon auditory nerve. Brain Res 70:431–447
Sachs MB, Woolf NK, Sinnott JM (1980) Response properties of neurones in the avian auditory system: comparisons with mammalian homologues and consideration of the neural encoding of complex stimuli. In:Popper AN, Fay RR (eds) Comparative studies of hearing in vertebrates. Springer, Berlin Heidelberg New York, pp 323–353
Salvi RJ, Perry J, Hamernik RP, Henderson D (1982) Relationships between cochlear pathologies and auditory nerve and behavioral responses following acoustic trauma. In: Hamernik RP, Henderson D, Salvi RJ (eds) New perspectives on noise-induced hearing loss. Raven Press, New York, pp 165–188
Salvi RJ, Henderson D, Hamernik RP (1983) Physiological basis of sensorineural hearing loss. In: Tobias J, Schubert E (eds) Hearing research and theory, Vol. 2. Academic Press, New York, pp 173–231
Saunders JC, Coles RB, Gates GR (1973) The development of auditory evoked responses in the cochlea and cochlear nuclei of the chick. Brain Res 63:59–74
Saunders JC, Tilney LG (1982) Species differences in susceptibility to noise exposure. In: Hamernik RP, Henderson D, Salvi RJ (eds) New perspectives on noise-induced hearing loss. Raven Press, N.Y., pp 229–248
Schermuly L, Klinke R (1985) Change of characteristic frequency of pigeon primary auditory afferents with temperature. J Comp Physiol A 156:209–211
Singer I, Fischer FP, Manley GA (1989) Hair-cell innervation in the basilar papilla in the European Starling (Sturnus vulgaris). Abstr. 26th Workshop Inner Ear Biology, p 60
Sullivan WE, Konishi M (1984) Segregation of stimulus phase and intensity coding in the cochlear nucleus of the barn owl. J Neurosci 4:1787–1799
Tilney MS, Tilney LG, DeRosier DJ (1987) The distribution of hair cell bundle lengths and orientation suggests an unexpected pattern of hair cell stimulation in the chick cochlea. Hearing Res 25:141–151
Warchol ME, Dallos P (1990) Neural coding in the chick cochlear nucleus. J Comp Physiol A 166:721–734
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Salvi, R.J., Saunders, S.S., Powers, N.L. et al. Discharge patterns of cochlear ganglion neurons in the chicken. J Comp Physiol A 170, 227–241 (1992). https://doi.org/10.1007/BF00196905
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DOI: https://doi.org/10.1007/BF00196905