Hallucination or delusion holds an important position in the study of psychology and issues relating to psychological disorder or its rehabilitation. Hallucination or illusion is a peculiar and distinctive thought created in spite of being opposed by real picture or arguments based on reason, in general as an indicator of psychological problem. It is a thought that is evidently counterfeit and shows an anomaly in the thought-process (mind). Main feature of an illusion is the level to which the individual is sure that the thought is real and existent. Hallucination or illusion does not inevitably have to be ...