Abstract

This study was an investigation of the role of task difficulty and variations in previous experience as variables which might influence the susceptibility of particular memories or habits to disruption by electroconvulsive shock. Three experiments were done in which a total of 86 rats learned spatial or visual discriminations with shock motivation. Electroconvulsive shock was administered 30 sec after criterion was reached. Large differences were found in the susceptibility of different habits to disruption by electroconvulsive shock, and large differences were found in the susceptibility of the same habit when it was preceded by different forms of pretraining. The limitations of existing hypotheses and some implications for theories of memory were considered.

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