Figure 7.
Maps of scotopically driven activity, sampled at different cortical depths, in one subject. In different panels, activity was sampled from voxels that intersected (and were centered on) the white-gray boundary, including layer 6 (left panel), from the middle of the cortical depth, including layer 4 (middle panel), and from the cortical surface, including layer 1 (right panel). Activity in the middle and right panels is color-scaled with minimum and maximum at P = 10−6 and P = 10−12, respectively. In the left panel, partly to compensate for the partial volume effects including the white matter, corresponding values are P = 10−2 and P = 10−4. Despite this difference in the level of significance, the overall pattern of scotopically driven activity remained similar across the cortical layers, as expected from a columnar organization.