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Neural circuits for long-range color filling-in

Abstract : Surface color appearance depends on both local surface chromaticity and global context. How are these inter-dependencies supported by cortical networks? Combining functional imaging and psychophysics, we examined if color from long-range filling-in engages distinct pathways from responses caused by a field of uniform chromaticity. We find that color from filling-in is best classified and best correlated with appearance by two dorsal areas, V3A and V3B/KO. In contrast, a field of uniform chromaticity is best classified by ventral areas hV4 and LO. Dynamic causal modeling revealed feedback modulation from area V3A to areas V1 and LO for filling-in, contrasting with feedback from LO modulating areas V1 and V3A for a matched uniform chromaticity. These results indicate a dorsal stream role in color filling-in via feedback modulation of area V1 coupled with a cross-stream modulation of ventral areas suggesting that local and contextual influences on color appearance engage distinct neural networks.
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https://hal.univ-rennes2.fr/hal-01887326
Contributor : Laurence Leroux <>
Submitted on : Thursday, October 4, 2018 - 8:44:59 AM
Last modification on : Monday, June 15, 2020 - 2:48:03 PM

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Peggy Gerardin, Clément Abbatecola, Frédéric Devinck, Henry Kennedy, Michel Dojat, et al.. Neural circuits for long-range color filling-in. NeuroImage, Elsevier, 2018, 181, pp.30 - 43. ⟨10.1016/j.neuroimage.2018.06.083⟩. ⟨hal-01887326⟩

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