What is the difference between Illusion, Delusion, and Hallucination?

According to JR. Block, Ph.D. (2002), Illusions are misperceptions that are perceived by most people, and are based on a specific stimulus received under certain conditions. Some experiments with animals indicate that several species of mammals and birds are “fooled” by illusions in much the same way we are. Delusions are beliefs, not perceptions. Like hallucinations, they tend to be found in people who are mentally ill and unstable. A person may have delusions of grandeur or delusions of when the facts clearly do not support these beliefs, creating an alternate reality for people with delusions. Hallucinations are usually seen by only one individual. Most often they are experienced by people who suffer from specific kinds of mental illness, or who are influenced by drugs or extreme amounts of alcohol. Hallucinations are false perceptions that occur in the absence of appropriate external stimuli, whereas illusions are misinterpretations of external stimuli that are, in fact, present.

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