The effects of a modest dose of alcohol on executive functioning and prospective memory

Montgomery, Catharine; Ashmore, Katie V.; Jansari, Ashok · 2011 · Crossref

DOI: 10.1002/hup.1194

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Summary

This study investigates the cognitive effects of acute alcohol intoxication on executive functioning and prospective memory (PM) using an ecologically valid virtual reality paradigm. Previous research relied heavily on laboratory-based tasks that may not reflect real-world cognitive demands, particularly regarding how intoxicated individuals manage everyday responsibilities. The authors aimed to determine if a modest dose of alcohol (0.4g/kg) impairs these functions and to examine the specific role of executive planning in PM performance. The researchers employed a double-blind, between-groups design with 40 healthy participants randomly assigned to receive either 0.4g/kg of alcohol or a matched placebo. Cognitive assessment was conducted using the Jansari, Agnew, Akesson, & Murphy (JAAM) task, a virtual reality simulation where participants assume the role of an office worker completing various tasks such as organizing meetings and handling post. This task measures five executive subscales (planning, prioritization, creativity, adaptability, and selection) and three types of prospective memory (time-based, event-based, and action-based). Participants also completed measures of subjective intoxication, mood, and fluid intelligence. Statistical analyses included MANOVA to assess group differences and linear regression to evaluate the relationship between planning and PM performance. The results demonstrated that alcohol intoxication significantly impaired overall JAAM performance. Specifically, the alcohol group performed worse than the placebo group on the executive subscales of planning, prioritization, creativity, and adaptability. In terms of prospective memory, alcohol significantly impaired time-based and event-based PM, but did not affect action-based PM or the executive selection subscale. Crucially, while breathalyzer readings confirmed intoxication in the alcohol group, there were no significant differences in subjective intoxication scores between groups, indicating participants did not perceive themselves as intoxicated. Furthermore, regression analyses revealed that executive planning significantly predicted performance on both time-based and event-based prospective memory tasks. These findings indicate that even modest doses of alcohol, which do not produce a subjective feeling of intoxication, can selectively impair complex executive functions and specific types of prospective memory. The study highlights that impairments are most pronounced in tasks requiring planning, prioritization, and cognitive flexibility, while simpler selection tasks remain preserved. The significant link between planning and PM performance suggests that executive planning is a critical component for successful prospective remembering in real-world contexts. The results imply that individuals engaging in routine duties after consuming modest amounts of alcohol may experience significant cognitive deficits without realizing their impairment, with potential implications for safety and workplace performance.

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• prospective memory interruptions