<prompt> Most common perceptual disturbance in delirium is?IllusionDecreased perceptions per unit of timeVisual HallucinationAuditory hallucination  <response>: Ans. isbi.e., Decreased perceptions per unit of timelRef: Neurology in Clinical Practice: Principles of diagnosis and management 4he p. 301The most common perceptual disturbance is decreased perceptions per unit of time. 