Chapter

What Is Reflected in Sensory Neocortical Activity: External Stimuli or What the Cortex Does with Them?

Henning Scheich, Frank W. Ohl, Holger Schulze, Andreas Hess and André Brechmann

in 23 Problems in Systems Neuroscience

Published in print January 2006 | ISBN: 9780195148220
Published online May 2009 | e-ISBN: 9780199864676 | DOI: http://dx.doi.org/10.1093/acprof:oso/9780195148220.003.0017

Series: Computational Neuroscience Series

 What Is Reflected in Sensory Neocortical Activity: External Stimuli or What the Cortex Does with Them?

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This chapter summarizes experimental evidence from animal and human auditory cortices in favor of the hypothesis that sensory cortex is not simply the head stage of “passive”stimulus analysis, but is also the locus of “active” processes, which make stimulus features cognitively explicit and available for tasks of variable demand. Several organizational principles are held responsible for this bottom-up/top-down interfacing within the sensory cortex. Top-down cognitive processes create new states within maps that can still be described as spatiotemporal activation patterns but may use coordinates of cognitive similarity rather than similarity at the initial stimulus-descriptive level.

Keywords: sensory cortex; auditory cortex; stimulus; passive; active; spatiotemporal activation patterns

Chapter.  9769 words.  Illustrated.

Subjects: Neuroscience

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