Plan formation, retention, and execution in prospective memory: A new approach and age-related effects

Kliegel, Matthias; McDaniel, Mark A.; Einstein, Gilles O. · 2000 · OpenAlex-citations

DOI: 10.3758/bf03209352

archive: archived pipeline: cataloged verified

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Summary

This study addresses the limitations of existing prospective memory paradigms, which typically focus on single, isolated actions and fail to capture the complexity of real-world tasks requiring the planning, retention, and execution of multiple delayed actions. The authors developed a modified laboratory paradigm based on the six-elements task to disentangle these distinct processes—plan formation, plan retention, plan initiation, and plan execution—and investigated age-related differences in these components. The research was motivated by the need to understand how aging affects complex prospective memory, particularly given equivocal findings in simpler tasks and theoretical suggestions that planning and execution involve different cognitive mechanisms. The experiment involved 62 participants, divided into younger (mean age 26.5) and older (mean age 71.3) adult groups. Participants were instructed to perform six subtasks (word finding, arithmetic, and picture naming) within a six-minute period to maximize points, adhering to specific sequencing rules. Crucially, they had to verbally generate a plan for this task, recall that plan after a 25-minute delay filled with distractor tasks, and then initiate and execute the task themselves upon a specific cue. During the delay, individual differences in working memory, retrospective memory, and inhibition were assessed using standardized tests. The study measured plan elaborateness, retention fidelity, initiation success, execution quantity, and execution fidelity. Results indicated significant age-related declines in plan formation, initiation, and execution. Younger adults produced significantly more elaborate plans than older adults, who tended to use simpler strategies. Younger adults were also more likely to successfully initiate the task at the correct cue (64.5% vs. 35.5%) and executed a greater number of subtasks. However, no significant age differences were found in plan retention or in the fidelity with which the executed actions matched the original plan. Regression analyses revealed that working memory capacity and inhibitory control significantly predicted successful plan initiation, while plan elaboration, retention, and inhibition predicted the number of subtasks executed. When these cognitive factors were accounted for, age was no longer a significant predictor of initiation or execution, suggesting that age-related deficits in complex prospective memory are mediated by declines in underlying cognitive processes. The study concludes that complex prospective memory involves distinct stages of planning and execution that must be separated analytically. It demonstrates that while older adults retain their plans and execute them with similar fidelity to younger adults, they struggle with the strategic planning and timely initiation required for complex tasks. These deficits are linked to age-related declines in working memory and inhibition. The findings imply that interventions or compensatory strategies for older adults should focus on supporting the planning and initiation phases of prospective memory, rather than assuming a general failure to remember or execute intentions.

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• prospective memory interruptions