Effects of stimulus spectral contrast on receptive fields of dorsal cochlear nucleus neurons

Lina Reiss, Sharba Bandyopadhyay, Eric D. Young

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Neurons in the dorsal cochlear nucleus (DCN) exhibit strong nonlinearities in spectral processing. Low-order models that transform the stimulus spectrum into discharge rate using a combination of first- and second-order weighting of the spectrum (quadratic models) usually fail to predict responses to novel stimuli for principal neurons in the DCN, even though they work well in ventral cochlear nucleus. Here we investigate the effects of spectral contrast on the performance of such models. Typically, the models fail for stimuli with natural-sound-like spectral contrasts (∼12 dB), but have good prediction performance at small (3-dB) contrasts. The weights also typically increase substantially in amplitude at smaller spectral contrast. These changes in weight size with contrast are partly inherited from similar effects seen in auditory nerve fibers, but there must be additional effects from inhibitory circuits in the DCN. These results provide insight into the reasons for the poor performance of spectrotemporal receptive field (STRF) models in predicting responses of auditory neurons. Because the general shapes of the weights do not change between low and high contrast, they also suggest that STRFs may capture meaningful properties of neural receptive fields, even though they do not do well at predicting responses.

Original languageEnglish (US)
Pages (from-to)2133-2143
Number of pages11
JournalJournal of Neurophysiology
Volume98
Issue number4
DOIs
StatePublished - Oct 2007
Externally publishedYes

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Cochlear Nucleus
Neurons
Weights and Measures
Cochlear Nerve
Nerve Fibers

ASJC Scopus subject areas

  • Physiology
  • Neuroscience(all)

Cite this

Effects of stimulus spectral contrast on receptive fields of dorsal cochlear nucleus neurons. / Reiss, Lina; Bandyopadhyay, Sharba; Young, Eric D.

In: Journal of Neurophysiology, Vol. 98, No. 4, 10.2007, p. 2133-2143.

Research output: Contribution to journalArticle

Reiss, Lina ; Bandyopadhyay, Sharba ; Young, Eric D. / Effects of stimulus spectral contrast on receptive fields of dorsal cochlear nucleus neurons. In: Journal of Neurophysiology. 2007 ; Vol. 98, No. 4. pp. 2133-2143.
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