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Driving while drinking: performance impairments resulting from social drinking.

Samuel G Charlton1, Nicola J Starkey1

  • 1Traffic and Road Safety Research Group, School of Psychology, University of Waikato, New Zealand.

Accident; Analysis and Prevention
|December 3, 2014
PubMed
Summary
This summary is machine-generated.

Alcohol impairs driving and cognitive performance, with effects influenced by blood alcohol concentration (BAC) levels. Expectancy effects strongly impact self-perceived intoxication during social drinking scenarios.

Keywords:
Acute protracted errorAlcoholCognitive performanceDrivingDriving simulatorExpectancy effectsSocial drinking

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Area of Science:

  • Psychology
  • Neuroscience
  • Traffic Safety

Background:

  • Alcohol's impact on driver performance varies with rising vs. falling blood alcohol concentrations (BAC).
  • Previous studies often lack ecologically representative alcohol consumption methods.

Purpose of the Study:

  • To investigate driver impairment patterns under a more naturalistic social drinking protocol.
  • To determine if BAC rise/fall effects persist in group settings over extended periods.

Main Methods:

  • Forty-four participants consumed alcohol in social groups, gradually reaching target BACs (.05 or .08) or placebo.
  • Cognitive (Cogstate) and simulated driving tasks were administered over a 4-hour intoxication curve.
  • Subjective intoxication ratings were collected alongside objective performance measures.

Main Results:

  • Significant placebo effects observed on subjective intoxication ratings.
  • Dose-dependent impairment in driving and cognitive performance was evident.
  • Acute protracted error was noted in some performance measures.

Conclusions:

  • Social drinking in groups over time replicates alcohol-induced driver impairment.
  • Expectancy effects play a substantial role in how individuals perceive their own intoxication.
  • Findings highlight the importance of considering social context and expectancy in alcohol research.