Wiener-kernel analysis of responses to noise of chinchilla auditory-nerve fibers.
Responses to broadband Gaussian white noise were recorded in auditory-nerve fibers of deeply anesthetized chinchillas and analyzed by computation of zeroth-, first-, and second-order Wiener kernels. The first-order kernels (similar to reverse correlations or "revcors") of fibers with characteristic frequency (CF) <2 kHz consisted of lightly damped transient oscillations with frequency equal to CF. Because of the decay of phase locking strength as a function of frequency, the signal-to-noise ratio of first-order kernels of fibers with CFs >2 kHz decreased with increasing CF at a rate of about -18 dB per octave. However, residual first-order kernels could be detected in fibers with CF as high as 12 kHz. Second-order kernels, 2-dimensional matrices, reveal prominent periodicity at the CF frequency, regardless of CF. Thus onset delays, frequency glides, and near-CF group delays could be estimated for auditory-nerve fibers innervating the entire length of the chinchilla cochlea.
Recio-Spinoso
Alberto
A
Department of Communication Sciences and Disorders, Northwestern University, 2240 Campus Drive, Evanston, IL 60208-3550, USA.
Temchin
Andrei N
AN
van Dijk
Pim
P
Fan
Yun-Hui
YH
Ruggero
Mario A
MA
D000161:Acoustic Stimulation / Q000379:methods; D000818:Animals; D002682:Chinchilla; D003056:Cochlear Nerve / Q000502:physiology*; D004307:Dose-Response Relationship, Radiation; D005072:Evoked Potentials, Auditory / Q000502:physiology; D008144:Loudness Perception / Q000502:physiology*; D008297:Male; D023421:Models, Animal; D009622:Noise; D016011:Normal Distribution; D011930:Reaction Time; D013997:Time Factors