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Probability of occurrence of the three trial types
| Baseline, % | Contrast only, % | Mixed, % |
| 37.5 | 37.5 (18.75 of CC trials + 18.75 of UU trials) | 25 (12.5 CU, 12.5 UC) |
CC, both stimuli crowded; CU, left-hand stimulus crowded, right-hand uncrowded; UC, left-hand stimulus uncrowded, right-hand crowded; UU, both stimuli uncrowded.
