Reflex Hallucinations

Reflex hallucinations are hallucinations in one modality of sensation experienced after experiencing a normal stimulus in another modality of sensation.

In reflex hallucinations, a stimulus in one sensory modality provokes a hallucination in another modality.

This is thought to be a morbid form of synesthesia Opens in new window; and it occurs when a normal sensory stimulus in one modality precipitates a hallucination in another, e.g. voices that are only heard whenever the lights are switched on.