palinopsia
Pronunciation: pal-in-OP-see-ah
Visual phenomenon where images persist or recur after the stimulus has been removed, indicating cortical visual processing dysfunction.
Full Definition
Palinopsia is an uncommon visual phenomenon characterized by the persistence or recurrence of visual images after the original stimulus has been removed from the visual field. This condition represents a dysfunction in cortical visual processing, particularly in the temporal-occipital regions responsible for visual memory and object recognition. Palinopsia can manifest as immediate persistence of images (like an afterimage that won't fade) or as delayed recurrence of previously seen objects or scenes. The condition is often associated with lesions in the posterior cerebral cortex, migraine aura, seizure activity, or certain medications. Patients may describe seeing 'trails' behind moving objects or experiencing visual 'echoes' of recently viewed images. The symptom can be highly distressing and may significantly impact visual function and daily activities.
Usage
Usage note: Rare condition; ensure accurate differentiation from more common visual symptoms like photopsia.
In Context
- "The patient experienced palinopsia following her posterior cerebral artery stroke." — Stroke follow-up note
- "Palinopsia manifested as persistent visual trails whenever objects moved across her visual field." — Symptom description