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

Harding, G.F.; Armstrong, Richard A. and Janday, B.S. Visual evoked electrical and magnetic response to half-field stimulation using pattern reversal stimulation. IN: Meeting of the Society for Experimental Optometry. 1992-07-01.

Abstract

The visual evoked magnetic response to half-field stimulation using pattern reversal was studied using a dc-SQUID coupled to a second-order gradiometer. The main component of the magnetic response consisted of a positive wave at around 100ms (P100M). At the same time this component was present the reponse to half-field stimulation consisted of an outgoing field contralateral and extending to the midline. When the left half-field was stimulates 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 correltly 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.

Divisions: Life & Health Sciences > Optometry
Life & Health Sciences > Ophthalmic Research Group
Life & Health Sciences > Health Sciences
Additional Information: Abstract appearing in Papers presented at the meeting of The Society for Experimental Optometry, in Birmingham; UK, on 27–28 July 1992, Ophthalmol Physiol Opt 12:171-174, 0275-5408.
Event Title: Meeting of the Society for Experimental Optometry
Event Type: Other
Event Dates: 1992-07-01
Uncontrolled Keywords: visual evoked magnetic response,half-field stimulation,pattern reversal,visual cortex

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