<prompt> Definition of hallucination ?Perception without stimulusAlteration of perception of a real stimulusChange in Intesitity of a real stimulusMisinterpretation of a real stimulus  <response>: Ans. is a i.e., Perception witout stimulus Disorder of perception may be : ? Altered perception : - There is alteration of preception of a real external stimulus. It may be : - Sensory distoion : - There is change in the intensity of a real external stimulus. For example micropsia perceiving a real object smaller than its normal size and hyperacusis perceiving sounds as abnormally loud. Illusion : - There is misinterpretation of a real external stimulus. For example mistaking a stick for snake. False perception : - There is an internal perception without a real external stimulus, e.g., Hallucination and pseudo-hallucination 