The Processing Mechanisms of Two Types of Mixed Prospective Memory

Gan, Jiaqun; Guo, Yunfei; Wang, Enguo · 2021 · OpenAlex-citations

DOI: 10.3389/fpsyg.2021.792852

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Summary

This study investigates the processing mechanisms of mixed prospective memory (MPM), a type of prospective memory requiring execution when both external event and time cues are present. While existing theories explain event-based prospective memory (EBPM), the mechanisms underlying MPM remain underexplored. The authors specifically examine how the clarity of time cues—divided into time-point MPM (specific time) and time-period MPM (time range)—affects attentional allocation under varying cognitive loads. The research aims to determine whether MPM processing aligns with the dynamic multiprocess theory, which posits that cognitive resources are invested selectively and dynamically based on cue predictability, rather than continuously as suggested by preparatory attentional processes (PAM) theory. The experiment involved 111 college participants assigned to one of four groups: EBPM, time-point MPM, time-period MPM, or a baseline control. Using a dual-task paradigm, participants performed an ongoing N-back task (manipulated for low or high cognitive load) while monitoring for specific prospective memory cues (letters G or R). In the time-point MPM condition, participants were informed cues would appear at a specific minute; in the time-period condition, they were told cues would appear after a certain duration. Performance was measured by prospective memory accuracy and ongoing task accuracy and response time, with the latter serving as an index of attentional interference. The ongoing task trials were segmented into early, middle, and later stages to analyze dynamic changes in attention allocation. Results indicated that time-point MPM yielded significantly higher prospective memory accuracy than both time-period MPM and EBPM. Regarding attentional allocation, high cognitive load conditions revealed distinct patterns. In the early and middle stages of the task, the time-point MPM group showed no significant attentional interference compared to the baseline, whereas the time-period MPM and EBPM groups exhibited reduced ongoing task accuracy, indicating attention consumption. However, in the later stage, all groups showed similar levels of interference. Specifically, time-point MPM participants conserved resources until the cue was imminent, while time-period MPM participants engaged in monitoring earlier due to cue ambiguity. These findings demonstrate that attention consumption in MPM is not static but varies dynamically based on the precision of time information. The study concludes that the processing mechanisms of MPM support the dynamic multiprocess theory. The ability to flexibly allocate attention depends on the clarity of time cues; precise time-point information allows for efficient resource conservation until the cue is near, whereas vague time-period information necessitates earlier and more sustained monitoring. This distinction highlights that MPM is not merely a hybrid of EBPM and time-based PM but possesses unique processing characteristics driven by the strategic use of temporal information. These findings refine theoretical models of prospective memory by emphasizing the role of cue predictability in modulating cognitive resource investment.

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• prospective memory interruptions