Figure 1
(A) MRI-compatible virtual reality reach setup. (B) Timeline of the delayed reach task (DRT) and the control task (CT) of Experiment 1. Subjects were supposed to reach the target (filled large circle) by moving their finger from the starting position (filled small circle) to the target in either clockwise or counter-clockwise direction, as was specified by the white arrow cue. These cues were shown in the CUE period of both conditions but were relevant only in the DRT. In the CT all initial cues were irrelevant and the ultimate movement was instructed by a new set of cues presented during the REACH phase. Each condition, DRT and CT, was indicated by its respective color cue, green and red, respectively. Colored dashed lines illustrate putative reach trajectories in both tasks. Additional afterimage-masks presented after both CUE and REACH screens are not shown (see “METHODS” for details). The objects are not plotted to scale. (C) Planning Activity. Inflated cortical surface with an overlay of the statistical contrast of delay-related planning activity (DRT > CT) obtained from 12 subjects in Experiment 1 (p < 0.001, uncorrected; t-value > 4.0). Labels identify regions of interest that were included in our ROI analyses. Major anatomical landmarks are labeled in addition. (D) Timeline of an exemplary delayed reach (DRT) and control trial (CT) in Experiment 2 (see RESULTS and compare B for details).
