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Chapter 10 - Corticothalamic Feedback in Vision

from Section 5: - Sensory Processing

Published online by Cambridge University Press:  12 August 2022

By
W. Martin Usrey
Edited by
Michael M. Halassa
Michael M. Halassa
Affiliation:
Massachusetts Institute of Technology
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Summary

The cortex and thalamus are richly interconnected by feedforward and feedback pathways. For vision, the lateral geniculate nucleus (LGN) of the dorsal thalamus supplies the primary visual cortex with synaptically strong feedforward input that carries information about the external environment. The cortex, in turn, sends an even greater number of axons back to the LGN; however, these corticogeniculate inputs are relatively weak. Based on this anatomy, the cortex appears to be able to modulate the nature of the signals it receives from the LGN, potentially to meet the ongoing processing needs of the cortex. This chapter examines the relationship between the feedforward and feedback pathways interconnecting the LGN and visual cortex, with an emphasis on their organization with respect to the parallel processing streams originating in the retina. It also explores the influence of corticogeniculate feedback on vision.

Keywords

cortexthalamusLGNcorticogeniculateparallel pathways
Type
Chapter
Information
The Thalamus , pp. 206 - 213
Publisher: Cambridge University Press
Print publication year: 2022

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