Real and Illusory Control Over Exposure to HIV in College Students and Gay Men1

Reasons for unsafe sex were examined using an illusions of control framework. Heterosexual college students (N= 301) and gay men (N= 248) were surveyed regarding perceived control over exposure to HIV, of vulnerability to HIV, use of illusory control in chance situations, and real and illusory strategies for protection against HIV. As predicted, the use of illusory control in chance situations was associated with more illusory HIV protection in both samples. Illusory protection strategies were associated with feeling less vulnerable to HIV which was mediated by perceptions of control over exposure to HIV. Suggestions for intervention include providing information about the illusory nature of some protective strategies and a focus on failing to protect oneself from STDs.     

Shape constancy from novel views

Prior experiments on shape constancy from novel views are inconclusive: Some show that shapes of objects can be recognized reliably from novel views, whereas others show just the opposite. Our analysis of prior results suggests that shape constancy from novel views is reliable when the object has properties that constrain its shape: The object has volumetric primitives, it has surfaces, it is symmetrical, it is composed of geons, its contours are planar, and its images provide useful topological information about its three-dimensional structure. To test the role of some of these constraints, we performed a set of experiments. Solid shapes (polyhedra) were shown on a computer monitor by means of kinetic depth effect. Experiment 1 showed that shape constancy can be reliably achieved when a polyhedron is represented by its contours (most of the constraints are present), but not when it is represented by vertices or by a polygonal line connecting the vertices in a random order (all the constraints are absent). Experiments 2 and 3 tested the role of individual constraints. Results of these experiments show that shape constancy from novel views is reliable when the object has planar contours and when the shapes of the contours together with topological information about the relations among the contours constrain the possible interpretations of the shape. Symmetry of the object and the topological stability of its image also contribute to shape constancy.     

Manipulation of familiarity reveals a necessary lexical component of the word-stem completion priming effect

These experiments were motivated by the idea that many types of nondeclarative memory are by-products arising from the plasticity that is inherent in much of the nervous system. We hypothesized that two types of repetition priming, word-stem completion (WSC) priming and perceptual identification (PI) priming, rely on different mechanisms because the WSC task and the PI task engage different cognitive and brain processes. We tested this hypothesis by manipulating word familiarity. The results, impaired WSC priming but intact PI priming with unfamiliar words, indicate that WSC priming relies primarily on a modification mechanism, whereas PI priming relies primarily on an acquisition mechanism. Our conclusions are consistent with component processes theories of nondeclarative memory.     

Mothers of Martyrs: A Palestinian Institution with Judaeo-Islamic Roots

One of the most remarkable heroes to emerge from the revolt of the Maccabees in 167 BCE was the mother who promoted the martyrdom of her seven sons. The influence of this story is exhibited in the great number of written versions of it which are still in existence. But more than that, we can see the actions of this mother, best known as Hannah, being repeated in modern times by Palestinian mothers. The behavior of mothers of martyrs is as powerful a tool as many women have for political action in traditional societies. This essay compares two versions of the story of the Maccabean mother, Fourth Book of the Maccabees and Midrash Rabbah on Lamentations, 1:16,50 with that of the first Islamic mother of martyrs, al-Khansa, to illustrate the characteristics of the role of the mother of martyrs and the roots of the Palestinian institution in Judeo-Muslim antecedents.     

The History of Family Therapy in South Africa

The history of family therapy in South Africa is presented from 1960 up to the present. The early days leading to the establishment of the South African Association of Marital and Family Therapy, national conferences, publications, national and international links are discussed.     

Java experiments for introductory cognitive psychology courses

Interactive on-line experiments provide a unique and useful method for communicating material to students that is otherwise cumbersome and often confusing. The Java programming language is particularly suited for Internet-based programming applications of this sort because it bypasses many technical issues, including resource availability, security, and cross-platform compatibility. In most cases, topics appropriate to this medium of presentation should (1) not be easily demonstrated by other means, (2) represent an important finding in the field, and (3) be robust with respect to variations in both participants and equipment. The present paper outlines the integration of interactive experiments into an introductory cognitive psychology classroom, describing several experiments currently available on the World-Wide Web (WWW). Evaluation of the technical aspects of the technology as well as expansion of the format to other courses is discussed.     

The Association Between Internalizing and Externalizing Behavior in Childhood and Early Adolescence: Genetic or Environmental Common Influences?

This study analyzed the genetic and environmental influences on internalizing and externalizing behavior problems and the nature of their cooccurrence in a national Norwegian twin sample. The sample comprised 526 identical and 389 fraternal same-sexed twin pairs from five birth cohorts, aged 5-6, 8-9, 12-13, 13-14, and 14-15 years. Behavior problems were assessed by parental ratings on the Child Behavior Checklist. A model of additive genetic, shared, and nonshared environmental influences was fitted to both internalizing and externalizing behavior in four sex and age groups. The considerable covariance,r = .51 to .58, between these traits is accounted for mainly by common environmental components; this effect was most marked in the 5 to 9-year olds. Concordance rates for children scoring above 1 standard deviation from the total sample mean on the internalizing scale only, externalizing scale only, or both indicated stronger genetic influences for internalizing or externalizing problems only than for combined problems.     

Attitudes to Authority in Women Religious

This study was designed to investigate the relationship between three stances in attitudes to authority and levels of intrapsychic and interrelational of maturity in women religious in initial stages of membership. Subjects were drawn from congregations throughout the U.S. from those involved in programs of formation or temporary commitment. The total sample (N = 162) was divided into three equal-attitude groups (N = 54), using complementary but uncorrelated measures of attitudes to institutional authority and directiveness. Relationship between the behavioral rating of directiveness seemed associated with intrapsychic measures of individuation, with those scoring as most directive found most mature from this perspective. Maturation rated from an intergenerational system approach seemed to be associated with pro-authority attitudes, with those most supportive of authority scoring highest on this construct. Implications for further research as well as work with religious in formation are suggested.     

A note on temporal relations between language and gestures

The initiation of the spontaneous gestures of Wernicke's aphasics was analyzed in relation to shifts in semantic content between the syntactic boundaries of main clauses and embedded clauses. Gestures proved more likely to arise at the initial boundaries of embedded clauses when these were semantically discontinuous with the main clause than when these were semantically related to the main clause. Spontaneous gestures may signal underlying shifts in semantic intention, thereby reflecting the difficulties encountered by Wernicke's aphasics in maintaining a coherent stream of thought across syntactic boundaries.