Voxelwise Maps and Region of Interest Time Courses for aIPS and LOC.

<p>Activation maps show group activation in aIPS, identified by Grasping>Reaching in Group A and in LOC, identified by Objects>Scrambled in Group B (RFX GLM contrasts; t >3 for aIPS; t >4.5 for LOC, corrected). Activation is superimposed on the group-averaged anatomical slices. Although group data is presented to illustrate the average location of the areas, time course data and statistical comparisons between conditions were performed on regions of interest extracted from individual subjects based on data from independent localizer runs. In individuals, areas aIPS (<b>A</b>) could be identified in the 9 of the 11 participants of Group A and LOC (<b>B</b>) could be identified in all 9 participants of Group B. In the time courses, the yellow vertical line indicates the time of the visual stimulus and the blue vertical line indicates the time of the action cue. Note that Go and Stop trials were indeterminate until the action cue; thus, time course graphs show only grasp (green) and reach (red) lines prior to the action cue (blue line). The Grasp Go (light green) vs. Grasp Stop (dark green) and Reach Go (light red) vs. Reach Stop (dark red) curves diverge after the action cue (blue line). Time points for which artifacts occurred for the Grasp Go and Reach Go events are indicated by dotted lines. For each area in each hemisphere and for each phase (Vision, Delay, Go, Stop), we tested whether the beta weights were significantly higher than baseline activation, whether activation was higher for grasping than reaching, and whether Go activation was higher than Stop activation. Only significant effects are reported.