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EEG PHOTICALLY ELICITED ALPHA BLOCKING RESPONSES IN DEPRESSIVE PATIENTS BEFORE AND AFTER CONVULSIVE THERAPY

Blocking of the alpha rhythm of the electroencephalogram, or alpha blocking response (ABR) to photic stimuli, has been found to last significantly longer in endogenously depressive patients than in a control group of normal individuals (Wilson @ Wilson 1961) and, in the same patients, during depression than on recovery after antidepressive treatment (Puulson & Gottlieb 1961, Zung 1969). In untreated chronic schizophrenics the response does not differ significantly from that of normals (Hezn et al. 1962).