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Temporal properties of feedforward and feedback pathways between the thalamus and visual cortex in the ferret

Published online by Cambridge University Press:  19 January 2007

Farran Briggs  and
W. Martin Usrey
Farran Briggs
Affiliation:
Center for Neuroscience, University of California, Davis, CA 95618, USA
W. Martin Usrey
Affiliation:
Center for Neuroscience, University of California, Davis, CA 95618, USA
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Abstract

This study examines the temporal properties of geniculocortical and corticogeniculate (CG) pathways that link the lateral geniculate nucleus (LGN) and primary visual cortex in the ferret. Using electrical stimulation in the LGN to evoke action potentials in geniculocortical and CG axons, results show that conduction latencies are significantly faster in geniculocortical neurons than in CG neurons. Within each pathway, axonal latency and visual physiology support the view of sub-classes of neurons. By examining the timing of visual responses and the latency of CG feedback, estimates indicate that visual information can reach the cortex and return to the LGN as early as 60 msec following the onset of a visual stimulus. These findings place constraints on the functional role of corticogeniculate feedback for visual processing.

Keywords

LGNV1corticogeniculategeniculocortical
Type
Research Article
Information
Thalamus & Related Systems , Volume 3 , Issue 2 , June 2005 , pp. 133 - 139
Copyright
© 2007 Cambridge University Press

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