MEG correlates of categorical perception of a voice onset time continuum in humans

Panagiotis G. Simos, Randy L. Diehl, Joshua I. Breier, Michelle R. Molis, George Zouridakis, Andrew C. Papanicolaou

Research output: Contribution to journalArticlepeer-review

50 Scopus citations


Event-related magnetic fields (ERFs) were recorded from the left hemisphere in nine normal volunteers in response to four consonant-vowel (CV) syllables varying in voice-onset time (VOT). CVs with VOT values of 0 and +20 ms were perceived as /ga/ and those with VOT values of +40 and +60 ms as /ka/. Results showed: (1) a displacement of the N1m peak equivalent current dipole toward more medial locations; and (2) an abrupt reduction in peak magnetic flux strength, as VOT values increased from +20 to +40 ms. No systematic differences were noted between the 0 and +20 ms stimuli or between the +40 and +60 ms CVs. The findings are in agreement with the results of multiunit invasive recordings in non-human primates regarding the spatial and temporal pattern of neuronal population responses in the human auditory cortex which could serve as neural cues for the perception of voicing contrasts.

Original languageEnglish (US)
Pages (from-to)215-219
Number of pages5
JournalCognitive Brain Research
Issue number2
StatePublished - Oct 1998
Externally publishedYes


  • Auditory cortex
  • Human
  • Magnetoencephalography
  • N1m
  • Speech
  • VOT
  • Voicing

ASJC Scopus subject areas

  • Experimental and Cognitive Psychology
  • Cognitive Neuroscience
  • Behavioral Neuroscience


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