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Sizes of the test stimulus and critical spacings. The test gratings were surrounded by same frequency or high frequency gratings having constant orientation from trial to trial.
| Observer | Size of the test grating |
Critical spacing | |||
|---|---|---|---|---|---|
| Same frequency distractors |
High frequency distractors |
||||
| Arcmin | periods | arcmin | periods | ||
| AM | 2.6 | 0.9 | 0.5 | 0.9 | 0.5 |
| EL | 2.6 | 0.9 | 0.5 | 0.9 | 0.5 |
| TN | 2.6 | 3.5 | 2.0 | 2.7 | 1.5 |
| NA | 2.1 | 2.8 | 2.0 | 1.4 | 1.0 |
| Mean | 2.5 | 1.95 | 1.25 | 1.5 | 0.875 |
