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law of constancy

1. the principle that visual stimuli retain a constant appearance despite alterations in stimulus conditions, such as the level of illumination (brightness constancy) or the angle subtended on the retina (size constancy).

2. in psychoanalytic theory, see principle of constancy.

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Psychology term of the day

February 24th 2025

psychooncology

psychooncology

n. the study of psychological, behavioral, and psychosocial factors involved in the risk, detection, course, treatment, and outcome (in terms of survival) of cancer. The field examines responses to cancer on the part of patients, families, and caregivers at all stages of the disease. —psychooncological adj. —psychooncologist n.