The Original Impetus for the Use of Electroconvulsive Shock Therapy

The original impetus for the use of electroconvulsive shock therapy (ECT) for people with psychological disorders came from the observation that:

A) an increase in epileptic symptoms was associated with a decrease in schizophrenic symptoms.
B) damage to the prefrontal cortex often leads to a decrease in overall activity.
C) levels of glucose metabolism vary as a patient switches between depression and mania.
D) depressed people often show memory deficits not found in healthy people.