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V1 BOLD fMRI response by stimulus contrast. The amplitude of evoked response within the V1 region was obtained for each subject and contrast level for the luminance (gray), melanopsin (cyan), and splatter (green) stimulus conditions. The 1× splatter condition presented cone contrast equal to the maximal inadvertent contrast (resulting from imperfections in device control) estimated from measurements of the spectra in the melanopsin experiments.
