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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.
G F Harding, and
R A Armstrong, and
B Janday
July 1997,
Brain research. Cognitive brain research,
G F Harding, and
R A Armstrong, and
B Janday
January 1985,
Electroencephalography and clinical neurophysiology,
G F Harding, and
R A Armstrong, and
B Janday
January 1982,
Electroencephalography and clinical neurophysiology,
G F Harding, and
R A Armstrong, and
B Janday
January 2001,
Brain topography,
G F Harding, and
R A Armstrong, and
B Janday
November 1989,
Bulletin des societes d'ophtalmologie de France,
G F Harding, and
R A Armstrong, and
B Janday
May 1994,
Graefe's archive for clinical and experimental ophthalmology = Albrecht von Graefes Archiv fur klinische und experimentelle Ophthalmologie,
G F Harding, and
R A Armstrong, and
B Janday
July 2000,
Brain research,
G F Harding, and
R A Armstrong, and
B Janday
April 1987,
Electroencephalography and clinical neurophysiology,
G F Harding, and
R A Armstrong, and
B Janday
October 1980,
Acta ophthalmologica,
G F Harding, and
R A Armstrong, and
B Janday
July 1977,
The British journal of ophthalmology,
