NDLI: A quadratic model captures the human V1 response to variations in chromatic direction and contrast

Content Provider	Directory of Open Access Journals (DOAJ)
Author	Michael A. Barnett Geoffrey K. Aguirre David Brainard
Abstract	An important goal for vision science is to develop quantitative models of the representation of visual signals at post-receptoral sites. To this end, we develop the quadratic color model (QCM) and examine its ability to account for the BOLD fMRI response in human V1 to spatially uniform, temporal chromatic modulations that systematically vary in chromatic direction and contrast. We find that the QCM explains the same, cross-validated variance as a conventional general linear model, with far fewer free parameters. The QCM generalizes to allow prediction of V1 responses to a large range of modulations. We replicate the results for each subject and find good agreement across both replications and subjects. We find that within the LM cone contrast plane, V1 is most sensitive to L-M contrast modulations and least sensitive to L+M contrast modulations. Within V1, we observe little to no change in chromatic sensitivity as a function of eccentricity.
e-ISSN	2050084X
DOI	10.7554/eLife.65590
Journal	eLife
Volume Number	10
Language	English
Publisher	eLife Sciences Publications Ltd
Publisher Date	2021-01-01
Publisher Place	United Kingdom
Access Restriction	Open
Subject Keyword	Medicine Science Biology (general) Color Vision Fmri V1 Isoresponse Contour Forward Model Contrast Response Function
Content Type	Text
Resource Type	Article

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A quadratic model captures the human V1 response to variations in chromatic direction and contrast