dysfunctions associated with sleep, sleep stages, or partial arousals

one of four basic types of sleep disorders, differentiated from the other types by the presence of physiological activations at inappropriate times during sleep rather than by abnormalities in the mechanisms involved in the timing of sleep and wakefulness. This type of sleep disorder includes nightmare disorder, sleep terror disorder, and sleepwalking disorder; in DSM–IV–TR and DSM–5, these are classified as parasomnias.

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Psychology term of the day

November 16th 2024

subcortical dementia

dementia caused by damage to or dysfunction of the subcortical (deeper) structures of the brain that may be due, for example, to Parkinson’s disease. It is marked by cognitive slowing, memory impairment (specifically, poor encoding and retrieval but intact storage), visuospatial abnormalities, and mood and affect disturbances. Compare cortical dementia.