Attention and the forward testing effect.

Memory retrieval affects subsequent memory in both positive (e.g., the testing effect) and negative (e.g., retrieval-induced forgetting [RIF]) ways, and can be contrasted with other forms of memory modification (e.g., study-based encoding). Divided attention substantially impairs study-based encoding but has a modest effect on retrieval. What of the subsequent learning consequences of retrieval? Earlier studies indicate that certain positive effects (i.e., the testing effect) are not reduced by distraction, whereas negative effects (i.e., RIF) are eliminated. The present study assessed an indirect (positive) effect of retrieval-the forward testing effect (FTE), in which prior retrieval or retrieval attempts enhance subsequent learning. Two experiments examined the role of attention in both the standard FTE and the pretesting effect. In Experiment 1, participants learned three study lists through retrieval practice or restudy, followed by a fourth study list. Prior retrieval practice enhanced subsequent new learning more than restudy (i.e., the standard FTE), and to a similar degree under full attention (FA) and divided attention (DA). In Experiment 2, participants learned cue-target word pairs by either studying the pair or guessing the target when shown a cue (i.e., pretesting) followed by the correct pair. Pretesting enhanced memory more than just studying to a similar degree under FA and DA. In sum, both forms of the FTE were unaffected by distraction, indicating that these positive consequences of retrieval are not based on controlled processes but instead appear to be relatively obligatory consequences of retrieval (or retrieval attempts). These results also have relevance for specific accounts of the standard FTE and the pretesting effect.