Task Dissociation in Prospective Memory Performance in Individuals With ADHD

Altgassen, Mareike; Kretschmer, Anett; Kliegel, Matthias · 2014 · Crossref

DOI: 10.1177/1087054712445484

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Summary

This study investigates prospective memory (PM) performance in adults with Attention Deficit/Hyperactivity Disorder (ADHD), specifically addressing whether deficits are general or task-specific. While ADHD is associated with executive function impairments that theoretically should hinder PM, previous research yielded inconsistent results. The authors aimed to resolve this by comparing event-based PM (triggered by external cues) and time-based PM (triggered by internal time monitoring) within the same sample and experimental paradigm, a comparison previously lacking in adult populations. The researchers employed a between-subjects design with 25 adults diagnosed with ADHD and 25 matched neurotypical controls. Participants completed the "Dresden Breakfast Task," a computerized simulation requiring them to prepare breakfast for four guests within seven minutes. This task integrated both PM types under parallel constraints: event-based tasks involved reacting to specific cues (e.g., switching off an egg cooker upon an acoustic signal), while time-based tasks required initiating actions at specific intervals (e.g., removing a tea bag after four minutes). Performance was measured by the accuracy of PM responses, time monitoring frequency, and ongoing task metrics, including plan quality and adherence. Results revealed a significant dissociation in PM performance. Adults with ADHD showed a large-sized impairment in time-based PM, completing significantly fewer correct tasks than controls. In contrast, there was no significant difference between groups in event-based PM performance, indicating that this function was spared. Additionally, the ADHD group demonstrated poorer plan quality and lower adherence to their self-generated plans compared to controls, though general ongoing task performance and time monitoring frequencies did not differ significantly between groups. Correlational analyses indicated that plan adherence predicted event-based PM success in both groups, but not time-based PM. The findings suggest that PM deficits in ADHD are not uniform but are specific to time-based tasks, which rely heavily on executive control processes like inhibition and working memory maintenance. The preservation of event-based PM supports the view that salient external cues facilitate retrieval, reducing the load on impaired executive functions. These results clarify the neurocognitive profile of ADHD, highlighting specific vulnerabilities in time management and strategic planning that likely contribute to everyday organizational difficulties. The study underscores the need for further research into the specific cognitive mechanisms underlying time-based PM failures in ADHD.

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• prospective memory interruptions