Memory for things forgotten.

As previous research has shown, items not recalled on an initial memory task are not simply forgotten. Often, some can be recalled on a later, second task. Further, subjects can generally predict, in terms of feeling-of-knowing (FOK) ratings, which items will be subsequently recalled. Two experiments were carried out to assess both second-task performance and FOK accuracy for unrecalled items as a function of two factors, encoding manipulations (levels of processing in Experiment 1, study time in Experiment 2) and the nature of the second task (explicit or implicit cued stem completion). Results indicate that although levels of processing affected explicit second-task performance more than implicit second-task performance, it increased FOK accuracy in both types of tasks. Study time, however, affected FOK accuracy only in the explicit second task. Apparently, only when subjects were able to do some elaborative processing on the items did their FOK ratings reflect information relating to factors that drive performance on implicit tasks.