Figure 1
Typical trial sequences of the adaptive SOA blocks in Experiment 1. Stimuli were always centrally presented, but only the stimulus needed for a task switch was presented immediately following the response stimulus interval (RSI). The stimulus needed for a task repetition was presented with a stimulus onset asynchrony (SOA) step size (50 ms) that depended on the previous task selection history (i.e., how often this task was selected before).
Table 1
Mean switch rates, mean reaction time (RT) and mean percentage errors (PE) as a function of trial transition (i.e., task switch vs. task repetition), mean RT switch costs and mean PE switch costs (i.e., task switch RT/PE–task repetition RT/PE) as a function of the two task mapping conditions and separately for each experiment (i.e., Experiment 1, 2, 3). Standard error of the means in parentheses.
| MEASURE | EXPERIMENT 1 | EXPERIMENT 2 | EXPERIMENT 3 | |||
|---|---|---|---|---|---|---|
| HANDS | FINGERS | HANDS | FINGERS | HANDS | FINGERS | |
| Switch rate | .29 (.03) | .33 (.03) | .18 (0.01) | .24 (0.01) | .39 (.03) | .40 (.02) |
| Task switch RT | 578 (15) | 569 (15) | 811 (23) | 766 (20) | 775 (19) | 785 (20) |
| Task repetition RT | 433 (7) | 424 (9) | 577 (15) | 586 (17) | 634 (19) | 663 (19) |
| Switch cost RT | 145 (13) | 145 (17) | 234 (17) | 180 (12) | 142 (15) | 121 (16) |
| Task switch PE | 6.8 (0.6) | 7.2 (0.7) | 7.0 (0.8) | 7.6 (0.9) | 4.0 (0.56) | 4.9 (0.68) |
| Task repetition PE | 5.5 (0.4) | 6.5 (0.6) | 2.7 (0.3) | 3.0 (0.4) | 3.3 (0.45) | 3.2 (0.44) |
| Switch cost PE | 1.3 (0.6) | 0.7 (0.8) | 4.2 (0.6) | 4.6 (0.7) | 0.8 (0.47) | 1.8 (0.40) |