Post-ECT Dyskinesia.

Three depressed individuals who developed a transient dyskinesia after right unilateral, nondominant electroconvulsive therapy (ECT) are described. The patients responded well to ECT in terms of their affective disorders, and were discharged free of permanent ECT-induced movement disorder symptoms. Risk factors and possible neurochemical changes underlying this phenomenon are discussed.

ECT in Post-Stroke Major Depression.

A depressed male patient, who had his first affective disturbance as a complication of a right parietotemporal cerebrovascular accident, was treated with unilateral, nondominant electroconvulsive therapy, administered ipsilateral to the lesion. This procedure produced adequate seizure duration with excellent clinical results and without new neurological or neuropsychological deficits.

Observational Learning of a Bar-Press by Rats.

In two experiments, the effects of presenting a conspecific on the simultaneous and subsequent acquisition of an operant were investigated. Experiment 1 indicated that albino rats which had a conspecific merely present in a nearby chamber did not learn as quickly as did those which were alone or those which observed a trained model displaying the operant. Experiment 2 indicated that subsequent to observing a model displaying the operant, Long-Evans rats learned more quickly than either the alone or mere-presence control.