Visual evoked electrical and magnetic response to half-field stimulation using pattern reversal stimulation

G.F. Harding, Richard A. Armstrong, B. Janday

Research output: Contribution to journalArticle

Abstract

The visual evoked magnetic response to half-field stimulation using pattern reversal was studied using a d.c. SQUID coupled to a second order gradiometer. The main component of the magnetic response consisted of a positive wave at around 100 ms (P100M). At the time this component was present the response to half-field stimulation consisted of an outgoing magnetic field contralateral and extending to the midline. When the left half field was stimulated the outgoing field was over the posterior right visual cortex and when the right half field was stimulated it was over the left anterior visual cortex. These findings would correctly identify a source located in the contralateral visual cortex. The orientation of the dipoles was not that previously assumed to explain the paradoxical lateralization of the visual evoked potential. The results are discussed in terms of both electrical and magnetic models of the calcarine fissure. © 1992.

Original languageEnglish
Pages (from-to)171-174
Number of pages4
JournalOphthalmic and Physiological Optics
Volume12
Issue number2
DOIs
Publication statusPublished - Apr 1992

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Visual Cortex
Visual Evoked Potentials
Occipital Lobe
Magnetic Fields

Keywords

  • visual evoked magnetic response
  • half-field stimulation
  • pattern reversal
  • d.c. SQUID
  • second order gradiometer
  • eye
  • human

Cite this

Harding, G.F. ; Armstrong, Richard A. ; Janday, B. / Visual evoked electrical and magnetic response to half-field stimulation using pattern reversal stimulation. In: Ophthalmic and Physiological Optics. 1992 ; Vol. 12, No. 2. pp. 171-174.
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Visual evoked electrical and magnetic response to half-field stimulation using pattern reversal stimulation. / Harding, G.F.; Armstrong, Richard A.; Janday, B.

In: Ophthalmic and Physiological Optics, Vol. 12, No. 2, 04.1992, p. 171-174.

Research output: Contribution to journalArticle

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