The impact of post-encoding alcohol consumption on episodic memory recall and remember-know responses in heavy drinkers

Benjamin Butterworth*, Christopher James Hand, Karen Lorimer, Julie Gawrylowicz*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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Introduction: People often consume alcohol following trauma, particularly in response to distressing memories. To date, little is known about how post-encoding alcohol consumption influences episodic memory recall for negative events. Understanding these effects may help to improve support for trauma victims – for example, witnesses and victims of crimes. Methods: We tested 60 participants who self-described as heavy drinkers. After watching an analog trauma film, half were allocated to consuming a moderate dose of alcohol (Alcohol-Exposed group), while half received a placebo drink (Placebo-Control group). Immediately and after a one-week delay, participants recalled the event via free and cued recall tasks. Participants also gave remember-know responses and confidence ratings, elucidating alcohol’s effect on experiential memory. Results: Free recall performance was similar for the Alcohol-Exposed group and the Placebo-Control group during Sessions 1 and 2. The Alcohol-Exposed group benefitted more from the delayed repeated retrieval attempt. For the cued recall task, the Alcohol-Exposed group provided more “Do not Know” responses compared to the Placebo-Control group in both sessions. For the Alcohol-Exposed group only “Correct Know” responses increased from Session 1 to 2. Although memory performance improved across sessions, confidence levels decreased from Session 1 to 2 in the Alcohol-Exposed group. Discussion: Post-encoding alcohol consumption appears to impact immediate episodic memory retrieval; however, this effect is only temporary in nature. No evidence was found that alcohol primarily reduces remembering responses. Much like previous findings focusing on pre-encoding alcohol consumption (Hagsand et al., 2017), current findings suggest that providing individuals who drank alcohol after witnessing an incident with a delayed repeated retrieval attempt can lead to more complete and accurate testimonies.

Original languageEnglish
Article number1007477
JournalFrontiers in Psychology
Publication statusPublished - 7 Mar 2023


  • alcohol
  • alcohol intoxication
  • cognition
  • episodic memory
  • memory
  • psychological trauma
  • traumatic event

ASJC Scopus subject areas

  • General Psychology


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