Figure 3. Activation tuning and symmetry in 2D slices through pericentral cortex.

Three sample pseudocoronal views of sensorimotor cortex with superimposed functional activation are given for two experiments, with (A) tip-to-base stimulation of digit 2 of subject 2, and (B) base-to-tip stimulation of the same digit. In each panel, cortical areas 4. 3a. 3b. and 1 are shown in grayscale according to the legend at right. The phase delays of active voxels are shown according to the reference bars at top (see Fig. 1). Black circles and associated Talairach coordinates give the location of the fundus in these slices, estimated as the centroid of the area 3a cortex. Approximate directions L (left), R (right), S (superior) and I (inferior) are given in (A), top. A scale bar is shown in (B), bottom.