drowsiness

n. a state of low alertness characterized by lowered frontal lobe (executive) functioning, difficulty in exerting mental effort, and an involuntary tendency for rapid skeletal muscle inhibition to occur. Electroencephalography shows intermittent sleep brain waves, including delta waves. See also hypersomnia; somnolence.

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Psychology term of the day

January 3rd 2025

unipolar disorder

persistent or pervasive depression that does not involve a manic episode, a hypomanic episode, or a mixed episode. As such, it contrasts with bipolar disorder. The term is sometimes used synonymously with major depressive disorder. Also called unipolar depression.