Table 3.
Number of trials per condition.
| Experiment | Time duration (ms) | IAPS high-arousing positive | IAPS high-arousing negative | IAPS low-arousing positive | Spider pictures |
|---|---|---|---|---|---|
| Experiments 1, 2, 5 | 400 | 5 | 15 | 5 | 15 |
| 600 | 5 | 15 | 5 | 15 | |
| 800 | 8 | 24 | 8 | 24 | |
| 1000 | 8 | 24 | 8 | 24 | |
| 1200 | 8 | 24 | 8 | 24 | |
| 1400 | 5 | 15 | 5 | 15 | |
| 1600 | 5 | 15 | 5 | 15 | |
| Experiments 3, 4 | 400 | 15 | 5 | 15 | 5 |
| 600 | 15 | 5 | 15 | 5 | |
| 800 | 24 | 8 | 24 | 8 | |
| 1000 | 24 | 8 | 24 | 8 | |
| 1200 | 24 | 8 | 24 | 8 | |
| 1400 | 15 | 5 | 15 | 5 | |
| 1600 | 15 | 5 | 15 | 5 |
Note that in Experiments 1, 2, and 5, for the two shortest (400, 600 ms) and longest (1400, 1600 ms) time durations, we randomly selected 15 pictures among the 24 IAPS high-arousing negative pictures as well as 15 pictures among the 24 spider pictures; and for the IAPS high- and low-arousing positive pictures we randomly selected 5 among the 8 pictures from our set. Similarly, for Experiments 3 and 4, for the two shortest and longest time durations, we randomly selected 5 pictures among the 8 IAPS high-arousing negative and spider pictures, and 15 pictures among the 24 IAPS high- and low-arousing positive pictures. Appendix 1 shows the list of the IAPS images used in Experiments 1–5.