Predicting the home location of serial offenders: a preliminary comparison of the accuracy of human judges with a geographic profiling system

The accuracy with which human judges, before and after 'training', could predict the likely home location of serial offenders was compared with predictions produced by a geographic profiling system known as Dragnet. All predictions were derived from ten spatial displays, one for each of ten different U.S. serial murderers, indicating five crime locations. In all conditions participants were asked to place an 'X' on each spatial display corresponding to where they thought the offender lived. In the control condition, a comparison was made between the accuracy of these predictions for 21 participants on two separate occasions a few minutes apart. In the experimental condition, between their first and second predictions the 21 participants were given two heuristics to follow--distance-decay and circle hypothesis. Results showed that participants with no previous knowledge of geographic profiling were able to use the two heuristics to improve the accuracy of their predictions. The overall accuracy of the second set of predictions for the experimental group was also not significantly different from the accuracy of predictions generated by Dragnet.     

The epidemiology of adolescent sex-role attitudes

This study examines the epidemiology of sex-role attitudes among a national probability sample of 1,626 American adolescents. The results of this study generally corroborate earlier findings with more limited samples: More traditional sex-role attitudes are reported by male, lower-class, and minority respondents. The magnitude of the sex difference overshadows the remaining differences. In addition, the impact of sex-role attitudes on conventional and delinquent behaviors and values was assessed. Sex-role groups differ in their involvement in the conventional settings of family, school, religion, and work, as well as in minor forms of delinquency and in their values concerning conventional and delinquent behaviors. The findings are discussed in terms of their contribution to our general understanding of adolescent sex-role attitudes.This study was supported by Center for the Studies of Crime and Delinquency, NIMH (Grant # MH 27552) and the Center for the Prevention and Control of Rape, NIMH (Grant # MH 31751).     

Sex-role stereotypes: Self-reports of behavior

The present study represents a self-reported behavioral approach to the study of sex differences and sex-role stereotypes. One hundred forty-eight undergraduate women and men responded anonymously in group testing sessions to two questionnaires. The first questionnaire asked them to report their own involvement in 45 masculine and feminine sex-typed behaviors; the second questionnaire asked for their perceptions of the involvement of men and women in the same behaviors. Major findings included (a) sex differences in reported ability, enjoyment, performance, and opportunity which mirrored traditional sex-role stereotypes and indicated greater competence at stereotypic behaviors (the majority of differences significant at p<.001); (b) perceptions of men and women's behavior also consistent with sex-role stereotypes; and (c) sex differences in the perceived appropriateness of behaviors (p<.05) which indicate greater sex-typing in men's (as compared with women's) perceptions of both sexes. The study focuses on the self-reported behavioral bases of gender-specific stereotypes and how these behaviors are influenced by aspects of the social environment (such as reinforcement contingencies) and by aspects of the the person (such as simple learning and performance deficits), and suggests ways in which sex differences might be changed to provide increased behavioral options for women and men.Portions of this research were supported by National Institute of Mental Health Grant #5 RO1 MH06613-4. The authors wish to express their gratitude to Drs. David Sanuders, Socrates Rapagna, William Hodges, and Gene Glass for their design, data analytic, and editorial assistance.     

Differentiating stranger murders: profiling offender characteristics from behavioral styles.

The literature on "offender profiling" suggests that different "styles" of homicide will reflect differences in the background characteristics of the offender. To test this suggestion, hypotheses were drawn from studies of aggression to propose that murder crime scenes would reveal stylistic distinctions in the role of the aggression in the offense. It was further hypothesized that these distinctions would be clearest for those crime scene indicators that reflect the instrument (cognitive) actions that shape the offense rather than the more expressive (impulsive and emotional) components. Hypotheses about associated offender characteristics were also deduced on the assumption that the murder scene theme revealed the killers' typical styles of interpersonal transaction. To test these hypotheses MDS analyses were carried out on the crime scene and offender characteristics derived from 82 single offender, single victim stranger homicides. A multivariate structure resulted, including all three hypothesized styles, allowing 65% of the cases to be assigned to unique styles and a further 36% to be assigned to appropriate hybrids. Offender characteristics related in the anticipated way to the different crime scene styles, providing a basis for law enforcement inferences about offenders in stranger murders.     

Achievement-related expectations and aspirations in college women

Two hundred unmarried female undergraduates (129 juniors, 71 seniors) participated in an investigation of the thesis that achievement in women is hindered by depressed occupational and educational aspirations, which are in turn influenced by a cluster of a cluster of achievement-related expectations. The study examined correlations among five achievement-related expectations (sex-role conception, expectations about the consequences of role-inappropriate achievement, expectations for success, peer expectations, and perceived discrimination), occupational and educational aspirations, and indices of past achievement and ability. The data support the hypothesized relation between expectations and aspirations. Sex-role conception, expectations of positive consequences from success, expectations of negative consequences from success, expectations for success, female peer expectations, and perceived discrimination were each significantly related to aspirations (p<.05 or above, in all cases). The implications of these findings, along with the high intercorrelations of expectation variables and results from path and factor analyses, are that there is considerable consistency in what women expect from themselves and their social environment, and that these expectations influence women's aspirations.This article is based in part on a dissertation submitted by the author to the faculty of the University of Colorado in partial fulfillment of the requirements for the doctoral degree. This research was supported by National Institute of Mental Health Grant #2TO1MH0661316PO. The author gratefully acknowledges the assistance of Drs. D. Wayne Osgood, Lawrence Severy, Kathleen Wells, John Forward, and Mr. Robert Burton in the preparation of this article, and Brynn Beacom, her research assistant, in the conduct of the study.     

An emerging research agenda for investigative interviewing: hypotheses from the narrative action system

The present issue of JIP-OP brings together an intriguing range of papers that cover a wide range of aspects of testimony and aspects of investigative interviewing. They show how the considerations of how testimony is obtained is broadening out from the memory improvement strategies that once dominated this area with attempts to detect deception, to cover many aspects of how testimony is obtained. This draws attention to the need for more careful examination of the variations in testimony eliciting processes that will be responsive to differences in context and crime. A research agenda is therefore proposed that draws on developments in the understanding of psychological differences between crimes. This research would study the relationship between the psychological processes underpinning offence actions and the interview behaviour of suspects or witnesses. With regard to suspects, recent developments in the modelling of offence style have indicated a narrative basis (narrative action system model) for understanding the patterns of offence actions and the perpetrator's psychological background and characteristics that can be inferred from these. It is therefore suggested that the Hero's Quest, Professional's Adventure, Revenger's Tragedy, and Victim's Irony offending narratives and the Object, Vehicle, and Person victim roles assigned within these, may provide a fruitful link to different patterns of interview behaviour, with consequent implications for approaches to interviewing. Copyright © 2009 John Wiley & Sons, Ltd.