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Previous studies have provided support for the idea that information activated during retrieval can act as a mediator that facilitates later recall of a target. Evidence for this has been obtained from a paradigm involving independent cues in which participants initially learn cue-target pairs through retrieval (Mother: _____) or restudying (Mother: Child), and later show stronger benefits of retrieval over restudy in recalling targets from final test cues that are strongly related to the original cue (Father: _____) compared to cues that are unrelated to the original cues (Birth: _____). The current study used a new paradigm to explore the role of mediators in learning from retrieval by comparing the advantage of retrieval over restudying for cue-target pairs that varied in mediator strength (i.e., the strength of the strongest first associate to the cue). Across three experiments, items higher in mediator strength (e.g., Chalk: Crayon, with Chalk producing its strongest first associate Board at a rate of .69) produced stronger testing effects than items lower in mediator strength (e.g., Soup: Onion, with Soup producing its strongest first associate Chicken at a rate of .10). Item analyses revealed that mediator strength was positively associated with final test recall of items learned through retrieval but not through restudying, and this relationship held after controlling for other linguistic properties of the cues.

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People often have erroneous knowledge about the world that is firmly entrenched in memory and endorsed with high confidence. Although strong errors in memory would seem difficult to "un-learn," evidence suggests that errors are more likely to be corrected through feedback when they are originally endorsed with high confidence compared to low confidence. This hypercorrection effect has been predominantly studied in laboratory settings with general knowledge (i.e., trivia) questions, however, and has not been systematically explored in authentic classroom contexts. In the current study, college students in an introductory horticulture class answered questions about the course content, rated their confidence in their answers, received feedback of the correct answers, and then later completed a posttest. Results revealed a significant hypercorrection effect, along with a tendency for students with higher prior knowledge of the material to express higher confidence in, and in turn more effective correction of, their error responses.