Magnetoencephalography and stereopsis: rhythmic cortical activity in humans recorded over the parieto-occipital cortex

U. Shahani*, G. Lang, D. C. Mansfield, D. M. Halliday, A. I. Weir, P. Maas, G. B. Donaldson

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

We have studied human stereopsis by analysing magnetoencephalographic signals during the presentation of stereograms using frequency analysis. The study of synchronised firing of cortical neurones is a new way of understanding information processing in the brain and it is hypothesised that frequencies greater than 35 Hz are used for higher-order processing. We report the response of cortical neurones involved in stereopsis recorded from over the occipital and parietal cortices using a single channel axial superconducting quantum interference device neuromagnetometer. Our main result was increased cortical activity in the gamma-band at frequencies apparently related to stereopsis and the perception of depth. Our results are consistent with reports in the literature that suggest that frequencies above 40 Hz are involved in attention, pattern recognition and higher order visual activity.

Original languageEnglish
Pages (from-to)154-158
Number of pages5
JournalNeuroscience Letters
Volume315
Issue number3
Early online date14 Nov 2001
DOIs
Publication statusPublished - 27 Nov 2001

Keywords

  • axial superconducting quantum interference device neuromagnetometer
  • frequency analysis
  • gamma-band
  • magnetoencephalography
  • stereopsis
  • synchronised firing

ASJC Scopus subject areas

  • General Neuroscience

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