Three distinct auditory areas of cortex (AI, AII, and AAF) defined by optical imaging of intrinsic signals

Noam Harel, Naoki Mori, Soichi Sawada, Richard J. Mount, Robert V. Harrison

Research output: Contribution to journalArticlepeer-review

53 Scopus citations

Abstract

Using pure-tone sound stimulation, three separate auditory areas are revealed by optical imaging of intrinsic signals in the temporal cortex of the chinchilla (Chinchilla laniger). These areas correlate with primary auditory cortex (AT) and two secondary areas, AII and the anterior auditory field (AAF). We have distinguished AI on the basis of concurrent single-unit electrophysiological recording; neurons within the AI intrinsic signal region have short (<15 ms) onset-response latencies compared with neurons recorded in AII and the AAF. Within AI, AII, and AA we have been able to define cochleotopic or tonotopic organization from the differences in intrinsic signal areas evoked by pure tones at octave-spaced frequencies from 500 Hz to 16 kHz. The maps in AI and AII are arranged orthogonal to each other. (C) 2000 Academic Press.

Original languageEnglish (US)
Pages (from-to)302-312
Number of pages11
JournalNeuroImage
Volume11
Issue number4
DOIs
StatePublished - Apr 2000
Externally publishedYes

Keywords

  • AAF
  • AI
  • AII
  • Auditory cortex
  • Auditory pathway
  • Cochleotopic
  • Intrinsic signal
  • Mapping
  • Optical imaging

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