Processing of first-order motion in marmoset visual cortex is influenced by second-order motion
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| Vydáno v: | Visual Neuroscience vol. 23, no. 5 (Sep 2006), p. 815-824 |
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Cambridge University Press
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| 100 | 1 | |a Barraclough, Nick | |
| 245 | 1 | |a Processing of first-order motion in marmoset visual cortex is influenced by second-order motion | |
| 260 | |b Cambridge University Press |c Sep 2006 | ||
| 513 | |a Comparative Study | ||
| 520 | 3 | |a 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. [PUBLICATION ABSTRACT] 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. | |
| 650 | 2 | 2 | |a Action Potentials |x physiology |
| 650 | 2 | 2 | |a Analysis of Variance |
| 650 | 2 | 2 | |a Animals |
| 650 | 2 | 2 | |a Brain Mapping |
| 650 | 2 | 2 | |a Callithrix |x anatomy & histology |
| 650 | 2 | 2 | |a Callithrix |x physiology |
| 650 | 2 | 2 | |a Motion |
| 650 | 1 | 2 | |a Motion Perception |x physiology |
| 650 | 1 | 2 | |a Neurons |x physiology |
| 650 | 1 | 2 | |a Orientation |
| 650 | 2 | 2 | |a Photic Stimulation |x methods |
| 650 | 2 | 2 | |a Psychophysics |
| 650 | 2 | 2 | |a Visual Cortex |x cytology |
| 650 | 1 | 2 | |a Visual Cortex |x physiology |
| 650 | 1 | 2 | |a Visual Pathways |x physiology |
| 653 | |a Temperature | ||
| 653 | |a Data collection | ||
| 653 | |a Contact lenses | ||
| 653 | |a Cells | ||
| 700 | 1 | |a Tinsley, Chris | |
| 700 | 1 | |a Webb, Ben | |
| 700 | 1 | |a Vincent, Chris | |
| 700 | 1 | |a Derrington, Andrew | |
| 773 | 0 | |t Visual Neuroscience |g vol. 23, no. 5 (Sep 2006), p. 815-824 | |
| 786 | 0 | |d ProQuest |t Health & Medical Collection | |
| 856 | 4 | 1 | |3 Citation/Abstract |u https://www.proquest.com/docview/198372971/abstract/embedded/H09TXR3UUZB2ISDL?source=fedsrch |
| 856 | 4 | 0 | |3 Full Text |u https://www.proquest.com/docview/198372971/fulltext/embedded/H09TXR3UUZB2ISDL?source=fedsrch |
| 856 | 4 | 0 | |3 Full Text - PDF |u https://www.proquest.com/docview/198372971/fulltextPDF/embedded/H09TXR3UUZB2ISDL?source=fedsrch |