Circular interpretation of regression coefficients

The interpretation of the effect of predictors in projected normal regression models is not straight-forward. The main aim of this paper is to make this interpretation easier such that these models can be employed more readily by social scientific researchers. We introduce three new measures: the slope at the inflection point (b_c), average slope (AS) and slope at mean (SAM) that help us assess the marginal effect of a predictor in a Bayesian projected normal regression model. The SAM or AS are preferably used in situations where the data for a specific predictor do not lie close to the inflection point of a circular regression curve. In this case b_c is an unstable and extrapolated effect. In addition, we outline how the projected normal regression model allows us to distinguish between an effect on the mean and spread of a circular outcome variable. We call these types of effects location and accuracy effects, respectively. The performance of the three new measures and of the methods to distinguish between location and accuracy effects is investigated in a simulation study. We conclude that the new measures and methods to distinguish between accuracy and location effects work well in situations with a clear location effect. In situations where the location effect is not clearly distinguishable from an accuracy effect not all measures work equally well and we recommend the use of the SAM.     

When the physical coldness in the viewer's environment leads to identification with a suffering protagonist

Based on theories of narrative engagement and embodied cognition, we hypothesised that a fit between the psychological state of a protagonist and the physical sensation of the viewer would enhance the subsequent identification with the protagonist, but not para-social relationship with him (seeing the protagonist as a friend). We also hypothesised that identification and a para-social relationship would lead to distinct effects on attitudes related to the narrative. Participants (N = 60) were randomly assigned to either a warmed or cooled room where they watched a movie clip alone in which a suffering protagonist wanted to undergo euthanasia while his close others wanted him to stay alive. Then, the participants answered a questionnaire measuring their identification and para-social relationship with the protagonist and their attitudes toward euthanasia. In accordance with the hypotheses, the results demonstrated that feeling cold enhanced identification with the suffering protagonist. However, the environmental temperature did not affect the development of para-social relationships. Moreover, identification with the suffering protagonist contributed to acceptance of his attitudes, reflected in more positive views of euthanasia. In contrast, having a para-social relationship with the protagonist resulted in negative attitudes toward euthanasia.     

Three-month-olds' visual preference for faces and its underlying visual processing mechanisms

This study was aimed at investigating the face preference phenomenon and its underlying mechanisms at 3 months of age. Using an eye-tracker apparatus, Experiment 1 demonstrated that 3-month-olds prefer natural face images to unnatural ones, replicating and extending previous evidence obtained with schematic facelike stimuli. Experiments 2 and 3 showed that the general mechanisms that induce face preference in newborns could not explain the same phenomenon at 3 months of age, when infants are attracted by perceptual cues more specific to faces. This suggests that signs of a process of cognitive specialization are already present in 3-month-olds' visual behavior toward faces.     

Preferred Prayer Styles and Anxiety Control

To date, the literature on prayer and anxiety has yielded mixed results. Recent development of a new instrument has improved our ability to measure individuals’ prayer activities, which may be a promising means of clarifying this literature. This correlational study examined preferred prayer styles and associated scores on measures of anxiety control and trait anxiety in a sample of 85 college students. Results suggested that individuals whose prayer styles were characterized by active rather than avoidant coping were likely to evidence greater perceived control of anxiety and lower levels of trait anxiety. Dr. Harris is a rehabilitation psychologist at the VA Medical Center in Minneapolis, MN. Dr. Schoneman is a clinical psychologist at Casa Pacifica and in private practice. Dr. Carrera is a counseling psychologist at the Psychological Services Center at the University of Cincinatti. Correspondence to J. Irene Harris, Staff Psychologist, VA Medical Center, One Veterans Drive, Minneapolis, MN 55417; e-mail: jeanette.harris2@med.va.gov.     

The structure of three-dimensional object representations in human vision: evidence from whole-part matching

This article examines how the human visual system represents the shapes of 3-dimensional (3D) objects. One long-standing hypothesis is that object shapes are represented in terms of volumetric component parts and their spatial configuration. This hypothesis is examined in 3 experiments using a whole-part matching paradigm in which participants match object parts to whole novel 3D object shapes. Experiments 1 and 2, consistent with volumetric image segmentation, show that whole-part matching is faster for volumetric component parts than for either open or closed nonvolumetric regions of edge contour. However, the results of Experiment 3 show that an equivalent advantage is found for bounded regions of edge contour that correspond to object surfaces. The results are interpreted in terms of a surface-based model of 3D shape representation, which proposes edge-bounded 2-dimensional polygons as basic primitives of surface shape.     

The interaction of objective and subjective organizations in a localization search task

We investigated how both objective and subjective organizations affect perceptual organization and how this perceptual organization, in turn, influences observers’ performance in a localization search task. Two groups of observers viewing exactly the same stimuli (objective organization) performed in significantly different ways, depending on how they were induced to parse the display (subjective organization). In Experiments 1 and 2, the observers were asked to describe the location of a tilted target among a varying number of vertical or horizontal distractors. Subjective organization was induced by instructing observers to parse the display into either three horizontal regions (rows) or three vertical regions (columns). The position of the target was critical: location performance, as assessed by reaction time and errors, was consistently impaired at the locations adjacent to the boundaries defining the regions, producing what we refer to as thesubjective boundary effect. Furthermore, the extent of this effect depended on whether the stimulus-driven and conceptually driven information concurred or conflicted. This made location information more or less accessible. In Experiment 1, the strength of objective grouping was a function of the proximity of the items (near or far conditions) and their orientation in a 6×6 matrix. In Experiment 2, the strength of objective grouping was a function of similarity of color (items were color coded by rows or by columns) and the orientation of the items in a 9×9 matrix. The subjective boundary effect was more pronounced when the display promoted grouping in the direction orthogonal to that of the task (e.g., when observers parsed by rows but vertical distractors were closer together [Experiment 1] or color coded [Experiment 2] to induce global columns). In contrast, this effect decreased when the direction of both objective and subjective organizations was parallel (e.g., when observers parsed by rows and horizontal distractors were closer together [Experiment 1] or were color coded [Experiment 2] to induce global rows). A localization search task proved to be an ideal forum in which objective and subjective organizations interacted. We discuss how these results indicated that observers’ performance in a localization task was determined by the interaction of objective and subjective organizations, and that the resulting perceptual organization constrained coarse location information.     

The relationship of gender,sex role,and law-and-order attitudes to nuclear opinions

Australian students' attitudes to nuclear weapons were considered in relation to sex-role identification and political orientations. By including a measure of sex-role orientation, we hoped to clarify earlier confusion surrounding gender as a predictor of nuclear views. Our hypothesis was that men and women with feminine sex-role orientations would display the strongest antinuclear feelings. Also, we predicted that an authoritarian political stance advocating strict law-and-order on the domestic front would predict support for nuclear weapons in international defense. The subjects were 46 male and 62 female first-year university students. The measure of nuclear attitudes was a 23-item inventory (NARQ) which had previously been extensively refined and validated for Australian populations (Jennings & Lawrence, 1986). The BSRI (Bem, 1974) measured sex-role orientation. An Australian law-and-order scale was also developed for this research. Latent trait models for rating data were applied to NARQ and law-and-order scales. The results revealed sex differences on approximately one-third of the nuclear opinion items, with men expressing stronger support for nuclear weapons in every case. Authoritarian law-and-order attitudes likewise predicted support for nuclear weapons in both men and women. A stepwise multiple regression analysis showed that BSRI masculinity and law-and order made separate, statistically significant, contributions to overall variation in nuclear views. These results were considered in relation both to previous research and to practical implications for political behavior.     

SINGLE-SEX VERSUS MIXED-SEX CLASSES AND GENDER SCHEMATA IN CHILDREN AND ADOLESCENTS

Positive effects for women and girls of all-female schools have been proposed, although there is relatively little clear empirical support for these beneficial results. Much of the cited research is based on elite all-female institutions or on parochial schools. This study takes advantage of the change of a private, nonparochial school from all girls to both sexes. Longitudinal data from grades 2 through 12 were collected over the course of the academic year to study the results of this transition. Stereotyping declined with age and over time in both types of class-rooms. Girls in single-sex classrooms showed some tendency to be more stereotyped in their perceptions of mixed-sex classrooms than did the girls who were actually in that setting. Thus, none of the measures showed any significant increase over time in stereotyping among girls in mixed-sex classes. Implications of these findings are discussed.