Faculty and Staff

Shade plays an important role in designing pedestrian-friendly outdoor spaces in hot desert cities. This study investigates the impact of photovoltaic canopy shade and tree shade on thermal comfort through meteorological observations and field surveys at a pedestrian mall on Arizona State University's Tempe campus. During the course of 1 year, on selected clear calm days representative of each season, we conducted hourly meteorological transects from 7:00 a.m. to 6:00 p.m. and surveyed 1284 people about their thermal perception, comfort, and preferences. Shade lowered thermal sensation votes by approximately 1 point on a semantic differential 9-point scale, increasing thermal comfort in all seasons except winter. Shade type (tree or solar canopy) did not significantly impact perceived comfort, suggesting that artificial and natural shades are equally efficient in hot dry climates. Globe temperature explained 51 % of the variance in thermal sensation votes and was the only statistically significant meteorological predictor. Important non-meteorological factors included adaptation, thermal comfort vote, thermal preference, gender, season, and time of day. A regression of subjective thermal sensation on physiological equivalent temperature yielded a neutral temperature of 28.6 °C. The acceptable comfort range was 19.1 °C-38.1 °C with a preferred temperature of 20.8 °C. Respondents exposed to above neutral temperature felt more comfortable if they had been in air-conditioning 5 min prior to the survey, indicating a lagged response to outdoor conditions. Our study highlights the importance of active solar access management in hot urban areas to reduce thermal stress.

Summer daytime cooling efficiency of various land cover is investigated for the urban core of Phoenix, Arizona, using the Local-Scale Urban Meteorological Parameterization Scheme (LUMPS). We examined the urban energy balance for 2 summer days in 2005 to analyze the daytime cooling-water use tradeoff and the timing of sensible heat reversal at night. The plausibility of the LUMPS model results was tested using remotely sensed surface temperatures from Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) imagery and reference evapotranspiration values from a meteorological station. Cooling efficiency was derived from sensible and latent heat flux differences. The time when the sensible heat flux turns negative (sensible heat flux transition) was calculated from LUMPS simulated hourly fluxes. Results indicate that the time when the sensible heat flux changes direction at night is strongly influenced by the heat storage capacity of different land cover types and by the amount of vegetation. Higher heat storage delayed the transition up to 3 h in the study area, while vegetation expedited the sensible heat reversal by 2 h. Cooling efficiency index results suggest that overall, the Phoenix urban core is slightly more efficient at cooling than the desert, but efficiencies do not increase much with wet fractions higher than 20%. Industrial sites with high impervious surface cover and low wet fraction have negative cooling efficiencies. Findings indicate that drier neighborhoods with heterogeneous land uses are the most efficient landscapes in balancing cooling and water use in Phoenix. However, further factors such as energy use and human vulnerability to extreme heat have to be considered in the cooling-water use tradeoff, especially under the uncertainties of future climate change.

This report integrated quantitative and qualitative methods across two studies to compile descriptive information about forensic psychologists’ occupational socialization processes. We also explored the relation between occupational socialization and forensic psychologists’ objectivity. After interviewing 20 board-certified forensic psychologists, we surveyed 334 forensic psychologists about their socialization into the field. Results indicated that the occupational socialization processes of forensic psychologists, including socialization about objectivity, varied widely across time and situation as the field has developed. Moreover, three hypotheses regarding occupational socialization were supported. It was positively and significantly associated with years of experience, t(284) = 3.63, p < 0.001, 95% CI = 0.05 – 0.16; belief in one’s ability to be objective, t(296) = 9.90, p < 0.001, 95% CI = 0.69 – 1.03; and endorsement of the usefulness of various bias correction strategies, r = 0.38 (p < .001, one-tailed). The implications of these results and directions for future research are discussed.

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.

Since its debut over a century ago, forensic psychology has matured into a formally recognized specialty area of psychology with its own set of ethical guidelines; however, a consensual definition of forensic psychology remains elusive. After describing the field’s historical and current struggles to define itself, two ethical issues are discussed that are especially applicable to psychology in legal contexts. The first is the critical differences between serving in therapeutic versus forensic roles and the associated ethical obligation to refrain from serving in both roles in the same case. Despite the terminology used in the literature, treatment in forensic contexts can be ethically appropriate. This chapter considers the current state of the literature regarding treatment in forensic contexts and suggests that this is likely to be an area of future growth for the field. The second ethical issue discussed in this chapter is the insidious effect of the adversarial process on psychologists’ objectivity in forensic contexts, termed “forensic identification” or “adversarial allegiance.” The forensic ethical guidelines affirm the primacy of this issue in forensic contexts, as evidenced by addressing it in the first two published guidelines. However, field and experimental evidence suggest psychologists have a challenging (if not impossible) task in avoiding partiality in adversarial forensic contexts. The chapter ends by briefly considering the methods psychologist might use in an effort to reduce partiality and by recognizing more research is needed to identify what else psychologists can do to strive to uphold the ethical guidelines in this regard.

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.

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.

Aside from an article by Gutheil, Bursztajn, Hilliard, and Brodsky (2004), scant literature exists regarding why forensic mental health professionals refuse or withdraw from cases. The current study collected descriptive information about the reasons mental health experts decline or withdraw from forensic assessments, both early and late in the legal process. In response to an online survey, 29 practicing forensic psychologists and psychiatrists presented examples of case withdrawal from their professional experiences. Their major reasons included ethical issues or conflicts, payment difficulties, and interpersonal or procedural problems with retaining counsel or evaluees. The results indicate that there are compelling personal and professional reasons that prompt forensic mental health experts to withdraw from or turn down cases.