A 2 × 2 factorial design was used to investigate the effects of electroconvulsive shock (ECS) and pseudo-ECS (PECS) on a passive avoidance response learned under 2 intensities of footshock (FS). There were no differential effects during acquisition, however, ECS and 0.3-ma. groups extinguished faster than PECS and 2.0-ma. groups.
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