Fig. 1.

Illustration of a task-switching sequence of 5 trials (top row). Each display shows a set of leaves with 2 main perceptual features: the pointing direction (as shown in the displays) and the movement direction (large arrow in second row). The task cue (pointing or moving; third row) is indicated by the color of the leaves as well as a label at the bottom of the display. Users have to respond with the direction of the cued dimension. The correct response (left, right, up, or down) is indicated by the highlighted key (bottom row). Trials 1 and 4 are congruent trials: The leaves point and move in the same direction. Trials 2, 3, and 5 are incongruent trials: The leaves point and move in different directions. In this sequence, trials 3 and 5 require a task switch.