Fig. 1.

Overview of the acquisition method and the topographic digit mapping of a subset of fingers (D1, D2, and D5) using VASO-CBV and BOLD in the 6 participants. A We carefully positioned the imaging slab (0.79 × 0.79 × 1.5 mm³) to cover the left primary sensorimotor area. B The participants performed individual finger movement on a block-designed task, using thumb (blue, D1), index (green, D2), and little (red, D5). C Each voxel was assigned to a single digit using a winner-take-all algorithm, creating a subset of digit representation maps. The digit representations are orderly organized (thumb-index-little) along the central sulcus, predominantly in S1. No smoothing has been applied on VASO-CBV or BOLD data