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Processing of first-order motion in marmoset visual cortex is influenced by second-order motion

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.

Publication metadata

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


DOI: 10.1017/S0952523806230141

PubMed id: 17020636


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