Vowel representations in the ventral cochlear nucleus of the cat: effects of level, background noise, and behavioral state

Journal of Neurophysiology
B J MayM B Sachs

Abstract

Single-unit responses were studied in the ventral cochlear nucleus (VCN) of cats as formant and trough features of the vowel /epsilon/ were shifted in the frequency domain to each unit's best frequency (BF; the frequency of greatest sensitivity). Discharge rates sampled with this spectrum manipulation procedure (SMP) were used to estimate vowel representations provided by populations of VCN neurons. In traditional population measures, a good representation of a vowel's formant structure is based on relatively high discharge rates among units with BFs near high-energy formant features and low rates for units with BFs near low-energy spectral troughs. At most vowel levels and in the presence of background noise, chopper units exhibited formant-to-trough rate differences that were larger than VCN primary-like units and auditory-nerve fibers. By contrast, vowel encoding by primary-like units resembled auditory nerve representations for most stimulus conditions. As is seen in the auditory nerve, primary-like units with low spontaneous rates (SR <18 spikes/s) produced better representations than high SR primary-like units at all but the lowest vowel levels. Awake cats exhibited the same general response properties as anesthetized cat...Continue Reading

References

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Citations

Aug 10, 2001·Journal of Neurophysiology·B H Gaese, J Ostwald
Feb 10, 2009·Journal of the Association for Research in Otolaryngology : JARO·Bradford J MayStephanie Saylor
Sep 1, 2017·Journal of Neurophysiology·Kate L Christison-LagayYale E Cohen
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Dec 28, 2019·PLoS Computational Biology·Go AshidaJutta Kretzberg

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