bottom-up hypothesis
   A generic name for a group of hypotheses that attribute the mediation of hallucinations primarily to a disorder of the data-driven processing of perceptual information, such as may occur in the context of * deafness, * blindness (i.e. the * Charles Bonnet syndrome), *sensory deprivation, or dysfunction of the primary sensory cortex. The term bottom-up hypothesis is used in opposition to the term * top-down hypothesis. The latter term refers to a group of hypotheses that attribute the mediation of hallucinations primarily to a disorder of the conceptual 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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