CJO - Abstract - The maximum range and timing of excitatory contextual modulation in monkey primary visual cortex

Visual Neuroscience (2006), 23 : 721-728 Cambridge University Press

Copyright © 2006 Cambridge University Press

doi:10.1017/S0952523806230049

Published online by Cambridge University Press 04 Oct 2006

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The maximum range and timing of excitatory contextual modulation in monkey primary visual cortex

D.M. ALEXANDER ^a1 ^c1 and J.J. WRIGHT ^a2
^a1 Faculty of Information Technology, University of Technology, Sydney, Australia
^a2 The Liggins Institute, University of Auckland, Auckland, New Zealand

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alexander dm [Google Scholar]

wright jj [Google Scholar]

Abstract

Contextual modulations of receptive field properties by distal stimulus configurations have been shown for a variety of stimulus paradigms. A survey of excitatory contextual modulation data for V1 shows the maximum scale of interactions, measured in terms of distance in V1, to be between 10 mm and 30 mm. Different types of excitatory contextual modulation in V1 occur throughout the interval of 40–250 ms after stimulus delivery. This window provides opportunity for global propagation of visual contextual information to a subset of V1 neurons, via several routes within the visual system. We propose a number of experiments and analyses to confirm the results from this empirical survey.

(Received November 30 2004)
(Accepted March 27 2006)

Key Words: Contextual modulation; Monkey; Primary visual cortex.

Correspondence:
^c1 Address correspondence and reprint requests to: Dr. David Alexander, Faculty of Information Technology, University of Technology, Sydney, P. O. Box 123, Broadway, 2007, NSW, Australia. E-mail: dalex@it.uts.edu.au