Table 1. The Mean Proportion of Correctly Recalled Exemplars (With Standard Errors in Parentheses) for the Three Levels of the Retrieval Practice Status Across Experiments 1 to 4.
| Experiment | Retrieval practice status | Effect sizes (Cohen’s d) | |||
|---|---|---|---|---|---|
| Rp+ | Nrp | Rp− | Rp | RIF | |
| Note. The right hand pair of values show the effect sizes (Cohen’s d) relating to the effect of retrieval practice (Rp; the differences between RP+ and Nrp) and retrieval induced forgetting (RIF; the differences between Nrp and Rp−) in each row condition. The bold values represent effect sizes of comparisons that were significantly different from Nrp. | |||||
| Experiment 1 | |||||
| RP group: First test | .798 (.023) | .597 (.024) | .529 (.030) | 1.284 | .465 |
| RP group: 7-day test | .658 (.037) | .440 (.031) | .404 (.032) | .941 | .183 |
| Experiment 2 | .798 (.021) | .658 (.019) | .513 (.026) | .982 | .887 |
| Experiment 3A | |||||
| 3 repetitions | .779 (.023) | .500 (.024) | .448 (.028) | 1.681 | .354 |
| 6 repetitions | .865 (.022) | .490 (.029) | .408 (.031) | 2.049 | .500 |
| Experiment 3B | |||||
| 1 practiced exemplar | .875 (.027) | .501 (.024) | .461 (.030) | 1.938 | .267 |
| 3 practiced exemplars | .785 (.022) | .486 (.025) | .423 (.036) | 1.930 | .337 |
| 5 practiced exemplars | .741 (.023) | .533 (.022) | .331 (.038) | 1.625 | .795 |
| Experiment 3C | |||||
| 6 exemplars | .715 (.028) | .385 (.029) | .354 (.033) | 1.574 | .172 |
| 12 exemplars | .585 (.029) | .311 (.018) | .247 (.018) | 1.590 | .703 |
| Experiment 4 | |||||
| Maximize remembering | .850 (.033) | .644 (.020) | .643 (.024) | .912 | .008 |
| Maximize forgetting | .766 (.022) | .681 (.022) | .550 (.042) | .787 | .545 |