4.8 Article

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

Journal

ELIFE
Volume 10, Issue -, Pages -

Publisher

eLIFE SCIENCES PUBL LTD
DOI: 10.7554/eLife.65590

Keywords

color vision; fMRI; V1; isoresponse contour; forward model; contrast response function; Human

Categories

Funding

  1. National Institutes of Health [RO1 EY10016, P30 EY001583]
  2. National Science Foundation Graduate Research Fellowship [DGE-1845298]

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The study found that V1 is most sensitive to L-M contrast modulations and least sensitive to L+M contrast modulations. Additionally, within V1, there was little to no change in chromatic sensitivity as a function of eccentricity.
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.

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