A perception in this context is any sensory experience, and the three broad types of perceptual disturbance are hallucinations, pseudohallucinations and illusions.

"You had a psychotic reaction, in the sense you had a perceptual disturbance," according to Dr. Friedman.

Other cognitive or perceptual disturbances.

He was suffering "perceptual disturbance" of a "severe and progressive form, intractable and with a strong negative prognosis."

People started coming unglued with mental disorientation and perceptual disturbances.

Change in cognition (e.g., problem-solving impairment or memory impairment) or a perceptual disturbance (hallucination)

Just today he'd told her that he was having perceptual disturbances and he'd had a long conversation with someone who wasn't there.

Withdrawal symptoms include anxiety, perceptual disturbances, distortion of all the senses, dysphoria, and, in rare cases, psychosis and epileptic seizures.

There can also be a number of other mood symptoms or perceptual disturbances which mimic primary psychiatric disorders.

Other common symptoms include intense perceptual disturbance such as visions of insects, snakes, or rats.