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FIG 2. Distribution of activated voxels among the different areas of interest, expressed as a percentage in relation to the total number of activated voxels in the examined brain volume, averaged across subjects.
A, Paradigm 1 (right hand versus rest).
B, Paradigm 2 (left hand versus rest).
C, Paradigm 3 (both hands versus rest).
D, Paradigm 4 (right versus left hand).
Whereas in paradigms 1 through 3, 12% to 25% of activated voxels are located outside the central region, the amount of extracentral activation is lowest in paradigm 4 (<5%). In contrast, paradigm 4 yields the highest proportion of activated voxels in the primary sensorimotor cortex along the central sulcus, facilitating its reliable identification.
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