FIGURE 2.

Image of the experimental set‐up, design, paradigm and timing. (a) The set‐up required participants to gaze at the fixation point, marked with a cross, while preforming the task. (b) Participant's view of the platform with the two oriented objects: counterclockwise‐left (CCW‐left) and clockwise‐right (CW‐right). (c) Experimental design. Participants performed four actions towards the instructed oriented object. Movements consisted of Align or Reach towards the CCW‐left or CW‐right object. As shown here, Align required the precise adjusting of a participant's hand over the object while Reach movements were coarse. (d) Experimental paradigm and timing. Each trial consisted of three phases: instruction, plan and execution. At the beginning of each trial, an auditory cue indicated the condition type to the participant (‘Reach Left’, ‘Reach Right’, ‘Align Left’ and ‘Align Right’). There was a delay of 10 s during which participants did not perform any action until they heard a ‘go’ cue upon which they performed the movement that they had been instructed at the beginning of the same trial. The end of the trial was cued by a ‘beep’ sound, which prompted participants to return the hand to the home position. We used a 12.5 s intertrial interval. We focused our analysis on the 7.5 s preceding action execution, during the plan phase. Lower panel: Group‐averaged % BOLD signal change extracted from the calcarine sulcus in the left hemisphere for Align and Open reach CCW‐left and CW‐right. Error bars indicate standard errors.