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Psychopharmacology

, Volume 204, Issue 4, pp 655–666 | Cite as

Acute effects of alcohol on the development of intrusive memories

  • James A. Bisby
  • Chris R. Brewin
  • Julie R. Leitz
  • H. Valerie Curran
Original Investigation

Abstract

Rationale

Post-traumatic stress disorder is characterised by repeated intrusive imagery of the traumatic event. Despite alcohol's impairing effect on memory and frequent involvement in real-life trauma, virtually nothing is known of the interaction between alcohol and trauma memory.

Objective

We aimed to investigate the acute alcohol effects on spontaneous memories following a trauma film as well as explicit memory for the film.

Methods

Utilising an independent-group double-blind design, 48 healthy volunteers were randomly allocated to receive alcohol of 0.4 or 0.8 g/kg or a matched placebo drink. A stressful film was viewed post-drink. Skin conductance was monitored throughout and mood and dissociative symptoms were indexed. Volunteers recorded their spontaneous memories of the film daily in an online diary over the following week. Their explicit memory for both gist and details of the film was tested on day 7.

Results

Intriguingly, an inverted ‘U’ alcohol dose–response was observed on intrusive memories with a low dose of alcohol increasing memory intrusions while a high dose decreased intrusions. In contrast, explicit memory performance after 7 days showed a linear dose–response effect of alcohol with both recall and recognition decreasing as dose increased.

Conclusions

These findings highlight a striking differential pattern of alcohol's effects on spontaneous memories as compared with explicit memories. Alcohol’s effect on spontaneous memories may reflect a dose-dependent impairment of two separate memory systems integral to the processing of different aspects of a traumatic event.

Keywords

Alcohol PTSD Memory Intrusions 

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Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  • James A. Bisby
    • 1
  • Chris R. Brewin
    • 2
  • Julie R. Leitz
    • 1
  • H. Valerie Curran
    • 1
  1. 1.Clinical Psychopharmacology UnitUniversity College LondonLondonUK
  2. 2.Research Department of Clinical, Education and Health PsychologyUniversity College LondonLondonUK

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