Does alcohol consumption really affect asymmetry perception? A three-armed placebo-controlled experimental study
Version of Record online: 4 APR 2012
© 2012 The Authors, Addiction © 2012 Society for the Study of Addiction
Volume 107, Issue 7, pages 1273–1279, July 2012
How to Cite
Halsey, L. G., Huber, J. W. and Hardwick, J. C. (2012), Does alcohol consumption really affect asymmetry perception? A three-armed placebo-controlled experimental study. Addiction, 107: 1273–1279. doi: 10.1111/j.1360-0443.2012.03807.x
- Issue online: 6 JUN 2012
- Version of Record online: 4 APR 2012
- Accepted manuscript online: 19 JAN 2012 11:36AM EST
- Submitted 17 June 2011; initial review completed 22 July 2011; final version accepted 13 January 2012
- Acute alcohol consumption;
- symmetry perception
Aims A possible explanation for increased levels of attractiveness of faces when under the influence of alcohol is the reduced ability to perceive bilateral asymmetry. This study tested the degree of preference by alcohol-dosed and non-alcohol-dosed participants for symmetrical faces and their ability to detect facial symmetry, while controlling for other explanations.
Design Volunteers were recruited to a random allocation experiment with three conditions: alcoholic drink (alcohol dosed), non-alcoholic drink (placebo) and diluted orange cordial (control). Data on concentration, personality and demographics were collected. Dependent variables were symmetry preference and detection.
Setting Laboratory, University of Roehampton.
Participants A total of 101 participants, mainly students (41 alcohol-dosed, 40 placebo, 20 control).
Measurements Participants provided verbal responses to images of faces which were presented on a computer screen for 5 seconds each; the first task required a preference judgement and the second task consisted of a forced-choice response of whether or not a face was symmetrical. Levels of concentration, weight and level of alcohol dose were measured, and demographics plus additional psychological and health information were collected using a computer-based questionnaire.
Findings In contrast to a previous investigation, there was no difference in symmetry preference between conditions (P = 0.846). In agreement with previous findings, participants who had not drunk alcohol were better at detecting whether a face was symmetrical or asymmetrical (P = 0.043). Measures of concentration did not differ between conditions (P = 0.214–0.438). Gender did not affect ability to detect symmetry in placebo or alcohol-dosed participants (P = 0.984, 0.499); however, alcohol-dosed females were shown to demonstrate greater symmetry preference than alcohol-dosed males (P = 0.004).
Conclusions People who are alcohol-dosed are subtly less able to perceive vertical, bilateral asymmetry in faces, with gender being a possible moderating factor.