Table 2. Behavioral performance for all conditions of experiment 2 (luminance).
| Action/Change | Hits (%) | FA rate | d′ | log β |
| Grasping | 7.3 | 0.46 | ||
| Small | 33.0 | 0.91 | (0.72) | |
| Medium | 73.7 | 2.05 | (0.60) | |
| Large | 86.5 | 2.52 | (0.05) | |
| Pointing | 8.2 | 0.53 | ||
| Small | 38.1 | 1.09 | (0.73) | |
| Medium | 70.1 | 1.91 | (0.59) | |
| Large | 87.3 | 2.47 | (0.27) |
‘Hits’: Percentage of correct detections. ‘FA rate’: Percentage of false alarms (indications of change when no change was present). ‘d′’: Measure of perceptual sensitivity. Log β: Measure of response bias towards either a change or no-change response.