Effects of genetic and environmental explanations of psychopathy and gender on perceptions of criminal behaviors

Abstract

ABSTRACTGenetic/biological evidence is increasingly introduced into courtrooms but findings regarding its impact are mixed. This study integrates research on psychopathy and the use of genetic evidence in legal contexts by considering how information on genetic causal accounts of psychopathy affect perceptions of culpability, recidivism, amenability to treatment, and sentencing severity. Perpetrator gender was examined as a moderator. Two-hundred thirty-eight undergraduates read a hypothetical violent crime vignette and mock expert testimony regarding psychopathy. The testimony included a diagnosis only, or a diagnosis plus genetic or environmental explanations of the etiology of psychopathy. Results indicated that a genetic account of psychopathy was not clearly perceived as aggravating or mitigating such that participants were more lenient in their perceptions of culpability yet more punitive in their sentencing recommendations when perpetrators were described to have genetically-caused psychopathy. An environmental account of psychopathy was mitigating but only for sentencing severity. In addition, although participants were more lenient in sentencing male and female perpetrators when provided with an environmental cause of psychopathy, participants judged male perpetrators most harshly when provided with a genetic cause of psychopathy. Implications of the relations between etiology and gender in legal decision-making are discussed.