primary insomnia

in DSM–IV–TR, a sleep disorder characterized by difficulty in initiating or maintaining a restorative sleep to a degree in which the severity and persistence of the sleep disturbance causes clinically significant distress, impairment in a significant area of functioning, or both. The disorder is not caused by a general medical condition or the effects of a substance and is not exclusively an aspect of another sleep disorder or mental disorder. It is termed insomnia disorder in DSM–5. See dyssomnia. Compare primary hypersomnia.

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Psychology term of the day

January 23rd 2025

intrinsic activity

1. the magnitude of a response to a drug regardless of dosage.

2. a measure of the efficacy of a drug-receptor complex in producing a pharmacological effect. Also called intrinsic efficacy.

3. the inborn readiness of babies to be inquisitive and to make contact with their environment. According to Jean Piaget, cognitive structures, by their very nature, seek to be active, predisposing the child to learn from experience with the environment.