Neal, Tess

This study examined how manipulations of likeability and knowledge affected mock jurors’ perceptions of female and male expert witness credibility (N=290). Our findings extend the person perception literature by demonstrating how warmth and competence overlap with existing conceptions of likeability and credibility in the psycholegal domain. We found experts high in likeability and/or knowledge were perceived equally positively regardless of gender in a death penalty sentencing context. Gender differences emerged when the expert was low in likeability and/or knowledge; in these conditions the male expert was perceived more positively than the comparable female expert. Although intermediate judgments (e.g., perceptions of credibility) were affected by our manipulations, ultimate decisions (e.g., sentencing) were not. Implications for theory and practice are discussed.

Prompted by the involvement of psychologists in torturous interrogations at Guantanamo and Abu Ghraib, the American Psychological Association (APA) revised its Ethics Code Standard 1.02 to prohibit psychologists from engaging in activities that would “justify or defend violating human rights.” The revision to Standard 1.02 followed APA policy statements condemning torture and prohibiting psychologists’ involvement in such activities that constitute a violation of human rights (APA, 2010). Cogent questions have subsequently been raised about the involvement of psychologists in other activities that could arguably lead to human rights violations, even if the activity in question is legal. While this language was designed to be expansive in defining psychologists’ ethical responsibilities, it remains difficult to determine whether and how Standard 1.02 might apply to a particular situation.

In the present analysis, we focus on the question of whether psychologists should be involved in death penalty cases. We assert that the APA should not take an ethical stand against psychologists’ participation in death penalty cases. Our position is not intended necessarily to reflect approval or disapproval of the death penalty although we recognize that there are serious flaws in the American legal system with regard to capital punishment. Our perspective is that psychologists have an important role in the administration of due process in capital cases. We oppose a bright-line rule prohibiting psychologists’ involvement in death penalty cases for several reasons. We begin by considering whether the death penalty per se constitutes a human rights violation, move on to describe the basic functioning of the legal system, analyze how the involvement of psychologists actually affects the capital trial process, and end with providing practical advice for psychologists’ provision of ethical services in capital trials.

The knowledge of experts presumably affects their credibility and the degree to which the trier of fact will agree with them. However, specific effects of demonstrated knowledge are largely unknown. This experiment manipulated a forensic expert’s level of knowledge in a mock trial paradigm. We tested the relation between low versus high expert knowledge on mock juror perceptions of expert credibility, on agreement with the expert, and on sentencing. We also tested expert gender as a potential moderator. Knowledge effects were statistically significant; however, these differences carried little practical utility in predicting mock jurors’ ultimate decisions. Contrary to hypotheses that high knowledge would yield increased credibility and agreement, knowledge manipulations only influenced perceived expert likeability. The low knowledge expert was perceived as more likeable than his or her high knowledge counterpart, a paradoxical finding. No significant differences across expert gender were found. Implications for conceptualizing expert witness knowledge, credibility, and their potential effects on juror decision-making are discussed.

This survey of 206 forensic psychologists tested the “filtering” effects of preexisting expert attitudes in adversarial proceedings. Results confirmed the hypothesis that evaluator attitudes toward capital punishment influence willingness to accept capital case referrals from particular adversarial parties. Stronger death penalty opposition was associated with higher willingness to conduct evaluations for the defense and higher likelihood of rejecting referrals from all sources Conversely, stronger support was associated with higher willingness to be involved in capital cases generally, regardless of referral source. The findings raise the specter of skewed evaluator involvement in capital evaluations, where evaluators willing to do capital casework may have stronger capital punishment support than evaluators who opt out, and evaluators with strong opposition may work selectively for the defense. The results may provide a partial explanation for the “allegiance effect” in adversarial legal settings such that preexisting attitudes may contribute to partisan participation through a self-selection process.

This study sought to investigate the relation between expert witness likeability and juror judgments of credibility and sentencing. Two actors playing expert witnesses were trained to present themselves as high and low in likeability in a standard testimony scenario involving capital trial sentencing. The effects of extraversion and gender in mock jurors in attending to expert testimony were also examined. The dependent variables were the perceptions of the witnesses’ credibility and agreement with testimony and the participants were 210 psychology undergraduates. Likeability of expert witnesses was found to be significantly related to judgments of trustworthiness of the experts, but not related to confidence or knowledge of the experts or to the mock juror sentencing decisions. Women participants rated high likeable experts as more credible than low likeable experts; men did not. For men jurors, agreement with testimony increased as extraversion increased. However, for women jurors, agreement with testimony decreased as extraversion increased. The results suggest that likeability can be an important element of source credibility, and that attorneys and trial consultants now have an empirical foundation for addressing likeability as part of witness preparation.

Prisoners sentenced to death must be competent for execution before they can actually be executed (Ford v. Wainwright, 1986). The decision for many mental health professionals whether to conduct competence for execution evaluations may be fraught with complex ethical issues. Mental health professionals who do not personally support capital punishment may have a particularly difficult decision to make in this regard but should seriously consider the consequences of their decisions. This article applies Bush, Connell, and Denney’s (2006) eight-step ethical decision-making model to the ethicality of deciding to or abstaining from conducting competence for execution evaluations. This article does not propose what decisions an individual evaluator should make regarding this work, but rather presents a systematic guide for mental health professionals (particularly those who do not support capital punishment) to consider.

This study examined the scope and components of mitigation assessments in a first effort to develop some guidelines for conducting mitigation evaluations. Using the Mitigation Evaluations Survey (MES) we developed for this research, we surveyed 266 psychologists about the characteristics and content of mitigation evaluations. A high percentage of participants endorsed each of the 14 content areas presented in the MES as essential or recommended for inclusion in mitigation evaluations. However, when the participants were given a hypothetical open-ended referral question regarding a mitigation evaluation, fewer participants included all 14 content areas in their responses. This discrepancy as well as information regarding the qualifications and expertise of the participants is discussed.