Abstract
Two experiments employed a combination of item method and list method directed forgetting methodologies (Bjork, LaBerge, & Legrand, 1968). Participants studied two lists of items, half of which were subsequently cued to-be-forgotten (TBF) or to-be-remembered (TBR). After the first study list, half of the participants were told to forget the entire list, whereas the remaining participants were told to remember it for a later test (e.g., list-method). The list-method forgetting instruction impaired recall of List 1 TBF and TBR items to the same extent. However, it enhanced recall of List 2 TBR items, but not TBF items. These results were found only among participants who reported engaging in effortful forgetting, whereas participants who reported doing nothing showed no effects of list-method directed forgetting. In Experiment 2, along with receiving a mid-list forget instruction, participants were given specific types of forgetting strategies that were most frequently reported in Experiment 1. The results showed that some strategies produced greater forgetting of List 1 items than others. Taken together, these findings highlight the role of effort required to achieve intentional forgetting. Implications for directed forgetting theories are discussed.
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