Locus of Control and Alcohol Placebo Effects on Performance in a Driving Simulator

Author:

Breckenridge Robert L.1,Dodd Michael O.2

Affiliation:

1. Northwestern State University of Louisiana

2. South Arkansas Regional Mental Health Center, El Dorado, Arkansas

Abstract

Performance in a driving simulator was evaluated as a function of locus of control, perceived alcohol ingestion (no alcohol versus a no-alcohol placebo), and sex. Using a pretest-posttest design, an analysis of covariance was performed using the pretest performance on a driving simulator as the covariate. There were 10 men and 10 women in each of four groups. As predicted, the external-scoring placebo subjects made more posttest errors than did the internal-scoring placebo group or either of the no-alcohol control groups. This indicated that the external-scoring placebo subjects were more affected by what they expected to happen than their actual physiological state warranted. A difference was also found in which external-scoring women made more errors than did any other group. This was an unexpected finding which, being inconsistent with previous findings involving sex, warrants further research.

Publisher

SAGE Publications

Subject

Sensory Systems,Experimental and Cognitive Psychology

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