Fig. 5.

Participants indicated the color of the print of the central word by pressing the button spatially congruent with one of the two color choices presented at the bottom of the screen. They were encouraged to construe groups of four trials as a single-task episode via an extended iTi at the end of each episode and by a background faded digit counting down the sequence to its completion (4-3-2-1). In a second block type trials were presented as a flat sequence with constant iTi across the block. All trials of such blocks had the digit ‘1’ in their background. (Color figure online)