We assessed the relative perceptions and influences of MD and PhD expert witnesses. Subjects in favor of or against the insanity defense and with strong or weak issue involvement read a transcript of a burglary and assault case in which either (a) a PhD testified for the defense and an MD testified for the prosecution or (b) an MD testified for the defense and a PhD testified for the prosecution. Verdicts, general attitude measures, and specific witness credibility evaluations indicated a medical bias, primarily in the PhD-defense/MD-prosecution condition. Limitations and implications are discussed.
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