In cats anesthetized lightly with pentobarbital or alpha-chloralose, electrical stimulation of the paramedian lobule of cerebellum resulted in a change of EEG pattern. Prior to stimulation the pattern consisted of h igh-ampl itude slow waves with superimposed low-ampl itude fast activity. In addition, the EEGs of animals anesthetized with chloralose showed "chloralose spikes." Immediately following brief cerebellar stimulation the slow wave activity and spikes disappeared, leaving only low-voltage fast activity. The effect was most pronounced in the contralateral leads from the rostral...