Hallucinations Hallucination Questionnaire Hallucinations can be of sight, sound, taste, smell, or touch. Hallucinations consist of seeing, hearing, tasting, smelling, or feeling sights, sounds, tastes, odors, or sensations no one else perceives. In Parkinson disease, hallucinations, if they occur, are invariably of sight. Hallucinations of sight, visual hallucinations, can be unformed or formed. Some doctors consider hallucinations as vivid dreams, dreams occurring while a person is awake.
Visual hallucinations can be frightening, or pleasant.
Unformed visual hallucinations consist of seeing distorted or mis-formed lights, lines, objects, or shapes. Visual hallucinations, with the exception of religious experiences, are abnormal. Visual hallucinations can result from changes in the brain, temporary or permanent, caused by electrolyte disturbances, high fevers, liver or kidney failure or drugs. Parkinson patients with dementia, and Parkinson patients suffering from an intellectual decline without dementia, are more likely to experience hallucinations on anti-Parkinson drugs. Visual hallucinations are abnormal.