Phase-locked responses to pure tones in guinea pig auditory cortex

Neuroreport. 2000 Dec 18;11(18):3989-93. doi: 10.1097/00001756-200012180-00017.


Phase-locked responses to pure tones are a characteristic of most auditory cells at the level of the brain stem and allow sophisticated analyses based on coincidence detection. Phase-locking to tones has not previously been shown at the level of the auditory cortex in single unit studies. We have now identified phase-locked responses in 10% of low-frequency (< 1 kHz) units in the ventrorostral belt, a strip of cortex immediately ventral to the primary auditory area. All of these units showed phase-locking in their response to binaural tone pips of 60-200 Hz and showed narrow band pass characteristics within this range.

MeSH terms

  • Acoustic Stimulation
  • Action Potentials / physiology*
  • Animals
  • Auditory Cortex / cytology
  • Auditory Cortex / physiology*
  • Auditory Perception / physiology*
  • Guinea Pigs
  • Neurons / cytology
  • Neurons / physiology*
  • Reaction Time / physiology