Figure 1.

Experimental design: Subjects performed a motor task in which a cued sequence of eight finger taps (“Sequence Presentation”) was performed over 5800 ms. Each dashed line represents one of the subject's fingers (excluding the thumbs); when a “+” appeared at the corresponding position, the subject tapped that finger. A total of five finger‐tapping sequences, separated by randomized inter‐trial intervals of 2200, 4400, or 6600 ms, was performed during each task block. During the “rest” block, subjects were asked simply to maintain fixation. The conditions subsumed by the heading “other” were not analyzed in this article; refer to Sun et al. [ 2007] for details.