Responses measured by BOLD fMRI in areas V1, V2, V3, and MT+ as two subjects (S2, gray; S3, black) switched between the speed and the contrast discrimination.

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Responses measured by BOLD fMRI in areas V1, V2, V3, and MT+ as two subjects (S2, gray; S3, black) switched between the speed and the contrast discrimination task. Responses measured by BOLD fMRI in areas V1, V2, V3, and MT+ as two subjects (S2, gray; S3, black) switched between the speed and the contrast discrimination task. Positive responses represent larger activity when subjects performed the contrast discrimination task. Note the change of scale along the y-axis. Two contrasts are shown. Error bars represent SEM. Giedrius T. Buracas et al. J. Neurosci. 2005;25:3023-3031 ©2005 by Society for Neuroscience