A synonym for the term hallucination. The adjective positive refers to the observation that something is perceived as being present, while lacking an appropriate source in the external world. The term positive hallucination is used in opposition to * negative hallucination, a term that is used to denote the failure to perceive an object or stimulus which is actually present in the external world, and which lies within the observer's range of perception.
References
Parish, E. (1897). Hallucinations and illusions. A study ofthe fallacies of perception. London: Walter Scott.
Dictionary of Hallucinations. J.D. Blom. 2010.