The effects of N,N-dimethyltryptamine on electrically evoked potentials in the visual system of the cat and the interaction of selected neuroleptic agents with ~ethyi~yp~mine were studied. Dimethyltryptamine caused a doss-dependent decrease in the amplitude of the response evoked by stimulation of the optic chiasm as recorded in the lateral geniculate nucleus and the visual cortex. Dimethyltryp...