The "bottom-up" and "top-down" components of the hallucinatory phenomenon

Book chapter


Aleman, Andre and Vercammen, Ans. (2012). The "bottom-up" and "top-down" components of the hallucinatory phenomenon. In In R. Jardri, A. Cachia and P. Thomas (Ed.). The Neuroscience of Hallucinations pp. 107 - 121 Springer.
AuthorsAleman, Andre and Vercammen, Ans
EditorsR. Jardri, A. Cachia and P. Thomas
Abstract

This chapter provides and overview of the literature on bottom-up and top-down processes that have been suggested as mechanisms in the generation and/or perpetuation of hallucinations, both in the context of disorders, and in otherwise health individuals. We start from the bottom-up, and first consider the case of abnormal perceptual pathway to consider the impact of attentional mechanisms on perception, and discuss these in the context models which integrate sensory and attentional deficits to explain to occurrence of hallucinations, such as the recent Perception and Attention Deficit model. Finally, we turn to theoretical frameworks that are implicitly based on Bayesian inference theory or perception. Central to these models is the concept that top-down factors such as expectations and prior world-knowledge greatly influence our perception. We also consider experimental evidence for the hypothesis that hallucinations are caused by an imbalance between top-down influences and bottom-up processing.

Page range107 - 121
Year2012
Book titleThe Neuroscience of Hallucinations
PublisherSpringer
Place of publicationUnited States of America
ISBN9781461441205
Publisher's version
File Access Level
Controlled
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