Figure 5.

Effect of Hand laterality on functional asymmetry in the 17 regions sensitive to hand laterality in right-hand and left-hand responders. In the 17 pairs of homotopic regions of interest (hROIs) the leftward asymmetry was larger when a right hand was presented in right-hand responders (left superior corner). Symmetrically, in the group of left-hand responders, the rightward asymmetry was larger when a left hand was presented (right superior corner). Note that asymmetry Parietal 4–5 did not show a rightward asymmetry although participants used their left hand to respond. The lower part of the figure displays the asymmetry of the right hand minus left hand contrast (thus canceling the motor activity related to the response). The pattern of asymmetry appeared comparable in both groups.