top-down hypothesis
   A generic name for hypotheses that attribute the mediation of hallucinations primarily to a disorder of the conceptual processing of perceptual information. Some examples of so-called top-down factors are prior knowledge, expectancy, attentional modulation, and "imagery. The term top-down hypothesis is used in opposition to " bottom-up hypothesis. The latter term refers to a group of hypotheses that attribute the mediation of hallucinations primarily to a disorder of the data-driven processing of perceptual information.
   References
   Aleman, A., Laroi, F. (2008). Hallucinations. The science of idiosyncratic perception.New York, NY: American Psychological Association.

Dictionary of Hallucinations. . 2010.

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