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J Am Acad Psychiatry Law 37:1:63-74 (2009)
Copyright © 2009 by the American Academy of Psychiatry and the Law.
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Expert Witness Confidence and Juror Personality: Their Impact on Credibility and Persuasion in the Courtroom

Robert J. Cramer, MA, Stanley L. Brodsky, PhD and Jamie DeCoster, PhD

Mr. Cramer is a doctoral student, Dr. Brodsky is Professor of Psychology, Dr. Decoster is Director, Social Cognition Laboratory, The University of Alabama, Tuscaloosa, AL. This paper was presented at the annual meeting of the American Psychology-Law Society in St. Petersburg, Florida, March 2006. The project was supported by a grant from the American Society of Trial Consultants. Address correspondence to: Robert J. Cramer, MA, University of Alabama, Box 870348, Tuscaloosa, AL 35487. E-mail: crame001{at}bama.ua.edu

The present study was conducted to investigate the relationship between both expert witness confidence and juror personality with expert witness credibility, as well as expert witness credibility with juror sentencing outcome. Participants were presented with one of three randomly assigned filmed scenarios depicting various levels of manipulated witness confidence. They then completed a sentencing outcome item, the Witness Credibility Scale, and the Goldberg Five-Factor Markers. Expert witness confidence had a significant main effect on ratings of credibility, with moderate levels of manipulated confidence yielding the highest credibility. Juror extroversion was positively related to perceptions of expert witness credibility. Finally, juror ratings of expert witness credibility, as well as two subcomponents, predicted juror sentencing outcome.




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S. L. Brodsky, T. M. S. Neal, R. J. Cramer, and M. H. Ziemke
Credibility in the Courtroom: How Likeable Should an Expert Witness Be?
J Am Acad Psychiatry Law, December 1, 2009; 37(4): 525 - 532.
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Copyright © 2009 by the American Academy of Psychiatry and the Law.