Does Covert Retrieval Benefit Learning of Key-Term Definitions?

Even though retrieval practice typically has a robust, positive influence on memory, response format (overt vs. covert retrieval) may moderate its effect when students learn complex material. Overt retrieval is likely to promote exhaustive retrieval, whereas covert retrieval may not be exhaustive for familiar key terms. In two experiments, students were instructed to study key-term definitions and were asked to practice retrieval overtly, to practice retrieval covertly, or to restudy the definitions. Students also made metacognitive judgments. A final criterion test was administered two days later. Students' final recall was greater after overt retrieval practice than after covert retrieval practice or restudy, with a continuously cumulating meta-analysis establishing the effect as moderate in size (pooled d=0.43). Thus, response format does matter for learning definitions of key terms, supporting the recommendation that students use overt retrieval when using retrieval practice as a strategy to learn complex materials.