10 cats were trained to perform an avoidance leg flexion at a signal: electrical stimulation of the caudate nucleus or the centre median. Thresholds were found to be elevated by anticonvulsants. In 3 of these cats, seizure discharges were induced by stimulation of the hippocampus and recorded on an EEG. The data are interpreted as indicating alteration of nerve impulse pathways. It is argued that such alteration may underlie dissociation of learning produced by various drugs and states.
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