Brain electrical and magnetic fields from verbal cognitive activities evoked by a visual task

Seiji Nakagawa, Keiji Iramina, Shoogo Ueno

Research output: Contribution to journalConference article

Abstract

This study focuses on the investigation of higher brain function using electroencephalogram (EEG) and magnetoencephalogram (MEG) techniques. We observed verbal cognitive activities by measuring EEGs and MEGs evoked by visually cognitive tasks. English words, meaningless sets of letters, and simple flashes were presented. We analyzed the EEG and MEG data with a subtraction technique and topographic maps. Visual evoked potentials (VEPs) associated with cognition of meanings were obtained by subtracting VEPs evoked by random letters from VEPs evoked by English words. The topographic EEG maps in several subjects show a clear interhemispheric difference between latencies of 300 and 600 msec. The EEG maps in a few subjects, however, show no interhemispheric differences.

Original languageEnglish
Pages (from-to)173-174
Number of pages2
JournalAnnual International Conference of the IEEE Engineering in Medicine and Biology - Proceedings
Volume16
Issue numberpt 1
Publication statusPublished - Dec 1 1994
EventProceedings of the 16th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. Part 1 (of 2) - Baltimore, MD, USA
Duration: Nov 3 1994Nov 6 1994

All Science Journal Classification (ASJC) codes

  • Signal Processing
  • Biomedical Engineering
  • Computer Vision and Pattern Recognition
  • Health Informatics

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