[Motion-onset visually evoked potential with nasal and temporal half- and full-field stimulation].
The known proportional increase in the amplitude of the pattern reversal visually evoked potential (VEP) with increasing stimulus area does not occur for the motion-onset VEP. When the stimulus area of the total field (6 degrees x 6 degrees) is compared to that of the half-field (6 degrees x 3 degrees), the N200 amplitude of the motion-onset VEP is not changed proportionally but remains almost constant. Reducing the pattern contrast beyond the saturation value for the motion-VEP yields essentially the same results. Contrary to the pattern reversal VEP, the amplitudes of the motion-onset VEP are found to be more pronounced for the nasal than for the temporal hemiretina. Our results support the notion of a genuine difference between the pattern- and the motion-analyzing visual system.
Göpfert
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Carl-Ludwig-Institut für Physiologie, Universität Leipzig, BRD.
Krug
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Orban
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D000328:Adult; D005074:Evoked Potentials, Visual / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010775:Photic Stimulation / Q000379:methods; D011930:Reaction Time / Q000502:physiology; D012160:Retina / Q000502:physiology*; D014793:Visual Cortex / Q000502:physiology; D014794:Visual Fields / Q000502:physiology*; D014795:Visual Pathways / Q000502:physiology
Durch Bewegungsbeginn visuell evozierte Potentiale bei Stimulation von nasalen und temporalen Halbfeldern sowie bei Ganzfeldreizung.