Motivated remembering efforts during tip-of-the-tongue states

Hart (1965) argues that the feeling of knowing in tip-of-the-tongue (TOT) states monitors memory content and motivates retreival efforts. Although a number of studies have examined the memory-monitoring accuracy of feelings of knowing and not-knowing, no studies have focused directly on the hypothesized motivational function of these feeling states. This second function of memory feeling states is investigated in this study by assessing the degree to which TOT and Don't Know (DK) states interfere with a subject's ability to perform well on a concurrent task. Subjects studied a list of arbitrary word pairs for 3, 5, or 7 seconds and then provided Recall, TOT, or DK reports in an immediate recall test. Performance on the simple number-probe task that followed each memory report was poorer on TOT trials than on DK trials. This effect did not vary as a function of encoding time. Since covert memory searches were possible on both TOT and DK trials, it is concluded that the performance decrement observed on TOT trials is due to the fact that covert TOT target searches command processing capacity that might otherwise go to the concurrent number-probe task. The absence of an encoding time effect suggests that TOT states do not monitor the associative strength of target traces as Hart (1967) has proposed. The findings in this study are interpreted as providing support for the proposition that the feeling of knowing in the TOT state influences the setting of capacity-allocation priorities in the memory system.