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Wiener Kernels of Chinchilla Auditory-Nerve Fibers: Verification Using Responses to Tones, Clicks, and Noise and Comparison With Basilar-Membrane Vibrations

¹Department of Communication Sciences and Disorders, Institute for Neuroscience and Hugh Knowles Center, Northwestern University, Evanston, Illinois; ²Department of Physiology, University of Wisconsin, Madison, Wisconsin; and ³Department of Otorhinolaryngology, University Hospital Groningen, School of Behavioral and Cognitive Neurosciences, University of Groningen, Groningen, The Netherlands

Submitted 25 August 2004; accepted in final form 13 January 2005

Responses to tones, clicks, and noise were recorded from chinchilla auditory-nerve fibers (ANFs). The responses to noise were analyzed by computing the zeroth-, first-, and second-order Wiener kernels (h₀, h₁, and h₂). The h₁s correctly predicted the frequency tuning and phases of responses to tones of ANFs with low characteristic frequency (CF). The h₂s correctly predicted the frequency tuning and phases of responses to tones of all ANFs, regardless of CF. Also regardless of CF, the kernels jointly predicted about 77% of the features of ANF responses to "frozen" samples of noise. Near-CF group delays of kernels and signal-front delays of responses to intense rarefaction clicks exceeded by 1 ms the corresponding basilar-membrane delays at both apical and basal sites of the chinchilla cochlea. This result, confirming that synaptic and neural processes amount to 1 ms regardless of CF, permitted drawing a map of basilar-membrane delay as a function of position for the entire length of the chinchilla cochlea, a first for amniotic species.

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