Functional localization of auditory cortical fields of human: Click-train stimulation

John F. Brugge, Igor O. Volkov, Hiroyuki Oya, Hiroto Kawasaki, Richard A. Reale, Albert Fenoy, Mitchell Steinschneider, Matthew A. Howard

Research output: Contribution to journalArticlepeer-review

53 Scopus citations


Averaged auditory evoked potentials (AEPs) to bilaterally presented 100 Hz click trains were recorded from multiple sites simultaneously within Heschl's gyrus (HG) and on the posterolateral surface of the superior temporal gyrus (STG) in epilepsy-surgery patients. Three auditory fields were identified based on AEP waveforms and their distribution. Primary (core) auditory cortex was localized to posteromedial HG. Here the AEP was characterized by a robust polyphasic low-frequency field potential having a short onset latency and on which was superimposed a smaller frequency-following response to the click train. Core AEPs exhibited the lowest response threshold and highest response amplitude at one HG site with threshold rising and amplitude declining systematically on either side of it. The AEPs recorded anterolateral to the core, if present, were typically of low amplitude, with little or no evidence of short-latency waves or the frequency-following response that characterized core AEPs. We suggest that this area is part of a lateral auditory belt system. Robust AEPs, with waveforms demonstrably different from those of the core or lateral belt, were localized to the posterolateral surface of the STG and conform to previously described field PLST.

Original languageEnglish (US)
Pages (from-to)12-24
Number of pages13
JournalHearing Research
Issue number1-2
StatePublished - Apr 2008


  • Auditory evoked potential
  • Heschl's gyrus
  • Human auditory cortex

ASJC Scopus subject areas

  • Sensory Systems


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