An electroencephalogram (EEG) is a test that detects electrical activity in your brain using small, metal discs (electrodes) attached to your scalp. Your brain cells communicate via electrical impulses and are active all the time, even when you're asleep.
The diagnosis of mental retardation in young children is frequently missed. ... child does not “look” retarded, assuming that a child who is ambulatory is unlikely to be retarded and, if ... Function at one half to two thirds of CA (IQ: 50 to 70) ... May respond to regular physical activity and social stimulation.
Electroconvulsive therapy (ECT) is a medical treatment most commonly used in patients with severe major depression or bipolar disorder that has not responded to other treatments. ECT involves a brief electrical stimulation of the brain while the patient is under anesthesia.
Psychological testing is the administration of psychological tests, which are designed to be "an objective and standardized measure of a sample of behavior". The term sample of behavior refers to an individual's performance on tasks that have usually been prescribed beforehand..