The effect of electroconvulsive shock on a conditioned emotional response: a control for acquisition recency.

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Abstract
The present experiment investigates the role of acquisition recency in the reported differential effects of ECS on a conditioned emotional response (CER) and on a lever-pressing habit. The CER appeared as a depression in the lever-pressing curve. A series of 21 ECSs virtually eliminated the emotional response acquired prior to lever pressing, but had no apparent effect upon lever pressing in the absence of the emotional stimulus. It is clear from these results that the differential effects of ECS cannot be attributed solely to differences in acquisition recency.