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Lookup NU author(s): Dr Christopher Tinsley, Dr Chris Vincent, Professor Andrew Derrington
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We measured the responses of single neurons in marmoset visual cortex (V1, V2, and the third visual complex) to moving first-order stimuli and to combined first- and second-order stimuli in order to determine whether first-order motion processing was influenced by second-order motion. Beat stimuli were made by summing two gratings of similar spatial frequency, one of which was static and the other was moving. The beat is the product of a moving sinusoidal carrier (first-order motion) and a moving low-frequency contrast envelope (second-order motion). We compared responses to moving first-order gratings alone with responses to beat patterns with first-order and second-order motion in the same direction as each other, or in opposite directions to each other in order to distinguish first-order and second-order direction-selective responses. In the majority (72%, 67/93) of cells (V1 73%, 45/62; V2 70%, 16/23; third visual complex 75%, 6/8), responses to first-order motion were significantly influenced by the addition of a second-order signal. The second-order envelope was more influential when moving in the opposite direction to the first-order stimulus, reducing first-order direction sensitivity in V1, V2, and the third visual complex. We interpret these results as showing that first-order motion processing through early visual cortex is not separate from second-order motion processing; suggesting that both motion signals are processed by the same system. Copyright © 2006 Cambridge University Press.
Author(s): Barraclough N, Tinsley C, Webb B, Vincent C, Derrington A
Publication type: Article
Publication status: Published
Journal: Visual Neuroscience
Year: 2006
Volume: 23
Issue: 5
Pages: 815-824
ISSN (print): 0952-5238
ISSN (electronic): 1469-8714
Publisher: Cambridge University Press
URL: http://dx.doi.org/10.1017/S0952523806230141
DOI: 10.1017/S0952523806230141
PubMed id: 17020636
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