<prompt> Hallucination and illusion are disturbances inThoughtPerceptionSensationMood  <response>: Ans. b Perception Ref. Kaplan Sadocks Synopsis of Psychiatry, 10th ed., p. 278Hallucination and illusion are disturbance in perception.Schizophrenia is a heterogeneous syndrome characterized by perturbations of language, perception, thinking, social activity, affect, and volition.Key Symptoms Of Depersonalization Depersonalization: Believe that heshe is not real, Out-of-Body Experience Derealization: Believe that the world is not real Perception Distortion of the environment during episodes of Depersonalization Jamais vu a sense of familiar things being strange Deja vu a sense of unfamiliar things being familiar 