The administration of electroconvulsive shock after foot shock in a passive avoidance learning situation produced retrograde amnesia if electroconvulsive shock occurred within 20 sec. of the foot shock. If the time interval between foot shock and electroconvulsive shock was 20 sec. or longer, retrograde amnesia was not observed. No behavioral differences were observed between two inbred strains of mice, the DBA/2J and the C57BL/6J.
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