Argyll Robertson pupil

a pupil that is nonresponsive to bright light (see pupillary reflex) or reacts slowly to drugs that induce pupil contraction but constricts with changes in focus (see accommodation). It is a sign of several diseases of the central nervous system, such as a brain tumor, multiple sclerosis, and neurosyphilis. [Douglas Argyll Robertson (1837–1909), British ophthalmologist]

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Psychology term of the day

May 9th 2024

perceptual distortion

skewed perceptual experience. Examples include the distorted images produced by dreams or hallucinogenic drugs, geometric illusions (e.g., the Müller-Lyer illusion), visions occurring in states of sensory deprivation or dehydration, and distortions produced by modifying auditory stimuli. Perceptual distortion may also occur as a consequence of acquired brain injury. See also metamorphopsia.