Tonotopic mapping in auditory cortex of the chinchilla

R. V. Harrison, A. Kakigi, H. Hirakawa, N. Harel, R. J. Mount

Research output: Contribution to journalArticlepeer-review

32 Scopus citations


Using single-unit electrophysiological methods we have mapped sound frequency (or cochleotopic) representation in the auditory cortex of the chinchilla. We describe the surgical approach to expose this area. We report on maps from six subjects and note a considerable variation in shape between individuals. In general, the primary area has a cochleotopic/tonotopic organization in which low frequencies are represented rostrally and higher frequencies caudally. Neurons in the primary area have latency and tuning properties comparable to other mammalian species. A region anterior to the primary (AI) auditory area has a reverse tonotopic map and may be analogous to the anterior auditory field (AAF) reported in other species.

Original languageEnglish (US)
Pages (from-to)157-163
Number of pages7
JournalHearing Research
Issue number1-2
StatePublished - Oct 1996
Externally publishedYes

Bibliographical note

Funding Information:
This research was supported by the Medical Research Council (Canada) and by the Masonic Foundation of Ontario.


  • auditory pathway
  • auditory perception
  • brain mapping
  • cochleotopic organization
  • electrophysiology


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