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- W3587749 abstract "Peristimulus inhibition in sensory pathways is generally attributed to lateral (horizontal) inhibitory connections. This chapter presents a recently proposed hypothesis that an additional mechanism, competitive distribution of activation, underlies some of the inhibitory effects observed in neocortex. Analysis of a mathematical model based on this hypothesis predicts that peristimulus inhibitory effects can be caused by competitive distribution of activation in the absence of lateral inhibitory connections. Computer simulations confirm these predictions by demonstrating Mexican Hat patterns of lateral interactions, transformation of initially diffuse activity patterns into tightly focused “islands” of activation, and edge enhancement. Analysis and simulations also show that the amount of inhibition can be adjusted by varying the intensity of the underlying competitive process. The concept of competitive distribution of activation provides an important perspective for interpreting neocortical and thalamocortical circuitry and can serve as a guide for further morphological and physiological studies. For example, it provides an explanation for the existence of recurrent cortex-to-thalamus connections that perform a logical AND-operation on thalamic activity, and predicts the existence of neocortical circuitry that performs an analogous function." @default.
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- W3587749 date "1992-01-01" @default.
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- W3587749 title "The Nature of Intracortical Inhibitory Effects11Supported by NINDS Awards NS29414 and NS16332. Dr. Reggia is also with the Institute for Advanced Computer Studies at the University of Maryland." @default.
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- W3587749 doi "https://doi.org/10.1016/b978-0-444-89330-7.50006-5" @default.
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