Is time-based prospective remembering mediated by self-initiated rehearsals? Role of incidental cues, ongoing activity, age, and motivation.

Kvavilashvili, Lia; Fisher, Laura B. · 2007 · OpenAlex-citations

DOI: 10.1037/0096-3445.136.1.112

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Summary

This research investigates the cognitive mechanisms underlying time-based prospective memory (PM), specifically addressing whether remembering to perform an action at a specific time is mediated by deliberate, self-initiated rehearsals or by more automatic processes. While event-based PM theories are well-developed, time-based PM lacks a consensus model, with existing frameworks like the Test-Wait-Test-Exit (TWTE) model positing effortful monitoring and the "Random Walk" model suggesting retrieval is triggered by incidental cues. The study aims to determine the nature of these retrieval processes in naturalistic settings with long delay intervals. The researchers conducted three studies using a naturalistic paradigm where participants were instructed to phone an experimenter at a self-selected time on the seventh day of the experiment. Participants maintained structured diaries to record every instance of rehearsing or recalling the intention, noting triggers (external, internal, or none), ongoing activities, and timing. Study 1 involved 40 young adults to establish baseline patterns. Study 2 replicated these findings while examining the effects of age and motivation, addressing discrepancies between laboratory and naturalistic age effects. Study 3 compared time-based tasks with matched event-based tasks to isolate the specific mechanisms of time-based retrieval. Results from Study 1 indicated that retrieval in time-based PM is predominantly automatic rather than deliberate. Of the recorded rehearsals, only 9% were attributed to self-initiated planning. The majority were triggered by incidental external cues (45%) or incidental internal thoughts (22%), while 24% occurred without any apparent trigger, suggesting the intention spontaneously "popped" into consciousness. Rehearsals were significantly more likely to occur during automatic, low-demand activities (62%) than during controlled, attention-demanding tasks. Performance was positively correlated with the frequency of rehearsals. Crucially, participants who successfully remembered the task on time (HIT group) exhibited a J-shaped distribution of rehearsals, with increased monitoring near the deadline, whereas those who were late did not show this pattern. The findings challenge the assumption that time-based PM relies on effortful, self-initiated monitoring. Instead, the data support a model where retrieval is mediated by automatic processes and incidental cues, consistent with the Random Walk model. The study also resolves a discrepancy in prior literature by demonstrating that the J-shaped monitoring pattern observed in laboratory studies also occurs in naturalistic settings, but only among successful performers. These results imply that successful time-based remembering depends on the availability of attentional resources during automatic activities and the occurrence of incidental triggers, rather than sustained strategic effort.

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• prospective memory interruptions