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Ten claims about the extrastriate symmetry network| old_uid | 17008 |
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| title | Ten claims about the extrastriate symmetry network |
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| start_date | 2019/01/24 |
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| schedule | 14h |
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| online | no |
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| summary | We can make ten claims about the symmetry perception, and rank-order them from highly plausible to moderately plausible. Claim 1) people and animals like visual symmetry, and use symmetry in mate choice. However, preference for symmetry in abstract patterns might be independent from attraction to symmetrical faces. Claim 2) There is a network of symmetry-sensitive brain areas in the extrastriate cortex. The primary and secondary visual cortices are not sensitive to symmetry. Converging evidence comes from comes from fMRI, TMS and EEG work. Claim 3) The extrastriate network responds to symmetry automatically, even when people are not attending to it. Claim 4) The amplitude of the symmetry response scales with the perceptual goodness (i.e. strength or salience) of different regularities. Claim 5) The network always responds to symmetry in the image. Sometimes it can go beyond this, and recover symmetry in the object. Claim 6) The network can code symmetry independently in each hemisphere. Claim 7) The network responds to both symmetry and anti-symmetry, but the response to symmetry is often stronger. Claim 8) The network is indifferent to colour of the elements. Claim 9) The network can integrate pattern information presented at different points in time. Claim 10) The dorsal stream drives spatial attention along the axis of reflection. I conclude that symmetry is useful for understanding the properties of mid-level vision, where consciously perceived structure emerges. |
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| responsibles | Fabre-Thorpe |
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