VISUAL-EVOKED POTENTIALS - PHENOTYPIC AND GENOTYPIC VARIABILITY

Evoked potentials (EPs) provide a unique way of analyzing the relation ship between genes and behavior. Individual differences in EPs, in res ponse to light flashes of two intensities and pattern reversal, were s tudied in families from the isolated population Mechelta in the Northe rn Caucasus. While there were no age or sex differences in EP latency, or many age effects on amplitude, there were sex differences on the a mplitude measures. Variation in the additive genetic determination of latency and amplitude measures is discussed. The largest estimates of additive genetic variation were found for the complexes of amplitude m easures between the positive and negative waveforms.