Misinterpretation of real stimuli is referred to as which phenomenon?

• A. Illusions
• B. Hallucinations
• C. Insight
• D. Judgment

Answer: (A)

Illusions are misinterpretations of real stimuli. The key idea is that something in the environment is actually there, but the brain analyzes it incorrectly, leading to a wrong perception. For example, a rope seen in dim light might be interpreted as a snake, or a coat on a peg might be taken for a person lurking nearby. The presence of an external stimulus is what defines an illusion, even though the perception is distorted.

This differs from a hallucination, where there is no external stimulus at all and the person experiences something sensory that isn’t really present, such as hearing voices when no one is speaking. Insight and judgment are cognitive functions related to awareness of one’s illness and to the ability to reason and make decisions, respectively, rather than misperceptions of the external world.