MacCoun, R. J. (1990). The emergence of extralegal bias during jury deliberation. Criminal Justice and Behavior, 17, 303-314.

Examined how deliberation moderates the extralegal influence of victim and defendant attractiveness in a mock trial experiment involving 321 undergraduates. Consistent with an information-integration theory analysis, M. F. Kaplan and L. E. Miller (1978) found that deliberation can eliminate such biases. However, Ss in the present study were influenced only by postdeliberation mock juror and jury judgments. When the defendant was attractive, judgments shifted toward acquittal, but when the defendant was unattractive, there was no such shift. As a result, mock juries were more likely to acquit the attractive defendant. Results suggest that the unattractive defendant did not receive the benefit of the doubt that is usually granted to criminal defendants.