Figure 1
The dual-tasking setup. On each trial, participants completed a two-choice task (Task 1; stimuli and responses: 1 or 2) and a four-choice task (Task 2, SRTT; stimuli X at the upper, lower, left or right position; response with corresponding arrow key). The order of stimuli in the two-choice task was random. The delay between stimulus onset in the two-choice task as well as the sequence of positions in the four-choice task followed fixed sequences of length four.
Table 1
Overview of the 3 [P]ractice blocks and 3 [T]est blocks in Experiment 1: The order of Blocks 4 to 6 was counterbalanced across participants.3 Seq is Sequenced and Ran is Random.
| Block | 1P | 2P | 3P | 4T | 5T | 6T |
|---|---|---|---|---|---|---|
| Timing | Seq | Seq | Seq | Seq | Ran | Ran |
| Stimulus | Seq | Seq | Seq | Ran | Seq | Ran |
Figure 2
Mean reaction times (RTs) for the two-choice task and the four-choice task (SRTT) in three types of blocks in Experiment 1 plotted with 95% within subjects confidence intervals based on the error variance of block (Masson & Loftus, 2003). The RTs are calculated from the onset of the particular stimulus of interest. The exact values can be found in Appendix Table A2.
Table 2
Overview of the 3 [P]ractice blocks and 4 [T]est blocks in Experiment 2: The order of Blocks 4 to 7 was counterbalanced across participants. Seq is short for Sequence and Ran is Random. Block 7 is the extra block in Experiment 2.
| Block | 1P | 2P | 3P | 4T | 5T | 6T | 7T |
|---|---|---|---|---|---|---|---|
| Timing | Seq | Seq | Seq | Seq | Ran | Ran | Seq |
| Stimulus | Seq | Seq | Seq | Ran | Seq | Ran | Seq |
Figure 3
Mean RTs with timing sequence, stimulus sequence and SOA factors for the two-choice task and the four-choice task (SRTT) in Experiment 2 plotted with 95% within subjects confidence intervals based on the error variance of timing sequence × stimulus sequence (Masson & Loftus, 2003). The exact values can be found in Appendix Table A4.