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Functional Anatomy and Interaction of Fast and Slow Visual Pathways in Macaque Monkeys

Functional Anatomy and Interaction of Fast and Slow Visual Pathways in Macaque Monkeys We measured the timing, areal distribution, and laminar profile of fast, wavelength-insensitive and slower, wavelength-sensitive responses in V1 and extrastriate areas, using laminar current-source density analysis in awake macaque monkeys. There were 3 main findings. 1) We confirmed previously reported significant ventraldorsal stream latency lags at the level of V4 (V4 mean 38.7 ms vs. middle temporal mean 26.9 ms) and inferotemporal cortex (IT mean 43.4 ms vs. dorsal bank of the superior temporal sulcus mean 33.9 ms). 2) We found that wavelength-sensitive inputs in areas V1, V4, and IT lagged the wavelength-insensitive responses by significant margins; this lag increased over successive levels of the system. 3) We found that laminar activation profiles in V4 and IT were inconsistent with feedforward input through the ascending ventral cortical pathway; the likely alternative input routes include both lateral inputs from the dorsal stream and direct inputs from nonspecific thalamic neurons. These findings support a Framing Model of ventral stream visual processing in which rapidly conducted inputs, mediated by one or more accessory pathways, modulate the processing of more slowly conducted feedforward inputs. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Cerebral Cortex Oxford University Press

Functional Anatomy and Interaction of Fast and Slow Visual Pathways in Macaque Monkeys

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References (43)

Publisher
Oxford University Press
Copyright
The Author 2006. Published by Oxford University Press. All rights reserved. For permissions, please e-mail: journals.permissions@oxfordjournals.org
ISSN
1047-3211
eISSN
1460-2199
DOI
10.1093/cercor/bhl067
pmid
16950866
Publisher site
See Article on Publisher Site

Abstract

We measured the timing, areal distribution, and laminar profile of fast, wavelength-insensitive and slower, wavelength-sensitive responses in V1 and extrastriate areas, using laminar current-source density analysis in awake macaque monkeys. There were 3 main findings. 1) We confirmed previously reported significant ventraldorsal stream latency lags at the level of V4 (V4 mean 38.7 ms vs. middle temporal mean 26.9 ms) and inferotemporal cortex (IT mean 43.4 ms vs. dorsal bank of the superior temporal sulcus mean 33.9 ms). 2) We found that wavelength-sensitive inputs in areas V1, V4, and IT lagged the wavelength-insensitive responses by significant margins; this lag increased over successive levels of the system. 3) We found that laminar activation profiles in V4 and IT were inconsistent with feedforward input through the ascending ventral cortical pathway; the likely alternative input routes include both lateral inputs from the dorsal stream and direct inputs from nonspecific thalamic neurons. These findings support a Framing Model of ventral stream visual processing in which rapidly conducted inputs, mediated by one or more accessory pathways, modulate the processing of more slowly conducted feedforward inputs.

Journal

Cerebral CortexOxford University Press

Published: Sep 1, 2006

Keywords: current source density dorsal stream response latency timing ventral stream wavelength sensitivity

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