COVARIABILITY OF VISUALLY EVOKED-POTENTIALS AND SIMPLE MOTOR REACTION-TIMES

Visually evoked potentials (VEPs) were recorded during simple motor re action time (RT) experiments using spatially localized, contrast modul ated visual stimuli. VEPs were averaged in groups, called ''subensembl es,'' depending on the speed of the subject's motor response. To a spe cific visual stimulus, the VEP response time of a subensemble covaries with motor response latency according to the same linear relationship found to describe conventionally averaged VEPs and RTs over a wide ra nge of stimuli.