Properties of spatial receptive fields in the central nucleus of the cat inferior colliculus. I. Responses to tones of low intensity

David R. Moore, Malcolm N. Semple, Paul D. Addison, Lindsay M. Aitkin

Research output: Contribution to journalArticlepeer-review

Abstract

Single neurones in the central nucleus of the inferior colliculus (ICC) of barbiturate-anaesthetized cats were examined using free-field, pure-tone stimuli of low intensity at the neurones' best frequency. Receptive field size was inversely correlated with best frequency. Almost all neurones were maximally excited by stimulus positions in the hemifield contralateral to the recording electrode, irrespective of their best frequency. Simultaneous cochlear microphonic recording revealed that the neurones' best excitatory area was also the spatial region associated with maximum amplification by the contralateral outer ear. This amplification resulted in extremely low ( < - 20 dB SPL in some neurones) best frequency thresholds. Response patterns were found not to vary markedly with speaker position. The results suggest that most ICC neurones are more sensitive to stimulation of the contralateral ear than to stimulation of the ipsilateral ear.

Original languageEnglish (US)
Pages (from-to)159-174
Number of pages16
JournalHearing Research
Volume13
Issue number2
DOIs
StatePublished - Feb 1984

Keywords

  • acoustics
  • cat
  • localization
  • midbrain

ASJC Scopus subject areas

  • Sensory Systems

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