M and P components of the VEP and their visual field distribution.
To study components related to parallel processing of information across the visual field, multi-focal pattern reversal visual evoked potentials (VEPs) were recorded using binary m-sequences. Contrast, chromatic, spatial and temporal characteristics of the stimuli were varied in order to favor contributions from either M or P pathways. Responses were decomposed into two additive components whose behavior was consistent with that of M and P mechanisms. The results suggest that contributions to the VEP from the M pathway precede those from the P pathway, and that the ratio of P/M contributions decreases with eccentricity.
Baseler
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Smith-Kettlewell Eye Research Institute, San Francisco, CA 94115, USA. heidi@white.stanford.edu
Sutter
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D000328:Adult; D015350:Contrast Sensitivity; D005074:Evoked Potentials, Visual; D005260:Female; D005403:Fixation, Ocular; D006801:Humans; D008297:Male; D010364:Pattern Recognition, Visual / Q000502:physiology*; D013997:Time Factors; D014793:Visual Cortex / Q000502:physiology; D014794:Visual Fields; D014795:Visual Pathways / Q000502:physiology