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FIG 2. Composite, axial T1-weighted image and fMR imaging activation map at the level of the primary visual cortex in a healthy volunteer at three luminance contrast levels: (A) lowest (baseline), (B) intermediate, (C) highest. Activation in the ROI, which represents the primary visual cortex within the medial portion of the occipital lobes (arrow, C), is shown in red and yellow, with yellow corresponding to the relatively more significantly activated voxels.
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