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| A-priori difficulty | Covarying features | Learners | Borderline | Non-Learners | Trials to learn: mean (SE) | Accuracy: mean (SE) |
|---|---|---|---|---|---|---|
| 1 | 6/6 | 7 | 1 | 3 | 140 (20) | 79% (4.1) |
| 2 | 5/6 | 8 | 0 | 3 | 194 (41) | 71% (4.7) |
| 3 | 4/6 | 5 | 3 | 2 | 278 (61) | 65% (3.04) |
| 4 | 3/6 | 8 | 0 | 2 | 138 (20) | 82% (3.7) |
| Total | 28 | 4 | 10 | 173 (18) | 74%(2.2) | |
