Table 2.
The CEs and JNDs for each illusion (in percentages), Experiment 1. The CE represents the magnitude of the illusion. The JND represents visual resolution for difference in size.
| Illusion | Session | N | Measure | Mean | SD | Skewness | Kurtosis |
|---|---|---|---|---|---|---|---|
| Ponzo | 1 | 125 | CE | 47.82 | 24.85 | 0.67 | 0.09 |
| JND | 12.47 | 7.06 | 1.48 | 2.94 | |||
| 2 | 119 | CE | 45.09 | 23.47 | 0.59 | 0.66 | |
| JND | 9.81 | 4.63 | 1.01 | 1.23 | |||
| Ebbinghaus | 1 | 131 | CE | 45.53 | 14.69 | 0.26 | −0.23 |
| JND | 8.06 | 4.11 | 1.19 | 2.08 | |||
| 2 | 133 | CE | 45.26 | 14.44 | 0.29 | −0.34 | |
| JND | 7.21 | 3.86 | 1.87 | 5.91 | |||
| Height–width | 1 | 138 | CE | 2.55 | 5.38 | −3.44 | 21.85 |
| JND | 4.41 | 2.31 | 1.32 | 2.94 | |||
| 2 | 136 | CE | 3.12 | 3.43 | −0.97 | 2.84 | |
| JND | 3.76 | 1.84 | 1.02 | 1.97 |