Peri-threshold encoding of stimulus frequency and intensity in the M100 latency

Steven M. Stufflebeam, David Poeppel, Howard A. Rowley, Timothy P.L. Roberts

Research output: Contribution to journalArticlepeer-review


RECENT work has suggested that, in addition to spatial tonotopy, pitch and timbre information may be encoded in the temporal activity of the auditory cortex. Specifically, the post-stimulus latency of the maximal cortical evoked neuromagnetic field (M100 or N1m) is a function of stimulus frequency. We investigated the additional effect of varying the stimulus intensity on the M100 response. A 37-channel biomagnetometer recorded neuromagnetic fields over the temporal lobe of healthy volunteers in response to monaurally presented tones. The frequency dependence of the M100 latency remained remarkably invariant even at low stimulus intensity. Thus, for peri- threshold stimuli, frequency information appears encoded in the temporal form of the evoked response.

Original languageEnglish (US)
Pages (from-to)91-94
Number of pages4
Issue number1
StatePublished - Jan 5 1998


  • Auditory cortex
  • Functional imaging
  • Magnetoencephalography (MEG)
  • Temporal coding
  • Tonotopy

ASJC Scopus subject areas

  • General Neuroscience


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