Neural circuits for long-range color filling-in

• DOI: 10.1101/223156
• Publication Date: 2017-12-06T10:07:01Z
• Authors: Peggy Gerardin; Clément Abbatecola; Frédéric Devinck; Henry Kennedy; Michel Dojat; Kenneth Knoblauch
• Keywords: Adult; Male; 0301 basic medicine; Brain Mapping; Support Vector Machine; Cognitive Neuroscience; 150; [SHS.PSY]Humanities and Social Sciences/Psychology; Magnetic Resonance Imaging; 004; [SHS]Humanities and Social Sciences; Pattern Recognition, Automated; Contrast Sensitivity; Young Adult; 03 medical and health sciences; 0302 clinical medicine; Neurology; Image Processing, Computer-Assisted; Humans; Female; Color Perception; Visual Cortex

AbstractSurface 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.