Genetic influences on the development of spatial skills during early adolescence

The course of development of skill at face encoding is disrupted in early adolescence. Evidence is provided that the timing of this disruption is under genetic control. Regardless of their age, girls in the midst of pubertal change encode faces less efficiently than prepubescent or postpubescent controls. This maturational influence on face encoding is contrasted with a different effect of pubertal development on another visuo-spatial ability, performance on the Embedded Figures Test (EFT). Regardless of their pubertal status at time of testing, girls who mature earlier are disadvantaged on EFT compared to those who mature later. The results for EFT replicate earlier findings on the relation between individual differences in the age at which adolescence begins and certain spatial skills. Several possible explanations for each of these effects—that of maturational status on face encoding and that of maturation rate on EFT—are discussed. Consideration of the relation between physical and mental growth is advocated as a source of constraints on explanations of cognitive development.     

Perinatal white matter injury: the changing spectrum of pathology and emerging insights into pathogenetic mechanisms

Perinatal brain injury in survivors of premature birth has a unique and unexplained predilection for periventricular cerebral white matter. Periventricular white-matter injury (PWMI) is now the most common cause of brain injury in preterm infants and the leading cause of chronic neurological morbidity. The spectrum of chronic PWMI includes focal cystic necrotic lesions (periventricular leukomalacia; PVL) and diffuses myelination disturbances. Recent neuroimaging studies support that the incidence of PVL is declining, whereas focal or diffuse noncystic injury is emerging as the predominant lesion. Factors that predispose to PVL during prematurity include hypoxia, ischemia, and maternal-fetal infection. In a significant number of infants, PWMI appears to be initiated by perturbations in cerebral blood flow that reflect anatomic and physiological immaturity of the vasculature. Ischemic cerebral white matter is susceptible to pronounced free radical-mediated injury that particularly targets immature stages of the oligodendrocyte lineage. Emerging experimental data supports that pronounced ischemia in the periventricular white matter is necessary, but not sufficient to generate PWMI. The developmental predilection for PWMI to occur during prematurity appears to be related to both the timing of appearance and regional distribution of susceptible oligodendrocyte progenitors. Injury to oligodendrocyte progenitors may contribute to the pathogenesis of PWMI by disrupting the maturation of myelin-forming oligodendrocytes. Chemical mediators that may contribute to white-matter injury include reactive oxygen species glutamate, cytokines, and adenosine. As our understanding of the pathogenesis of PWMI improves, it is anticipated that new strategies for directly preventing brain injury in premature infants will develop.     

SELF-IMAGE,INFORMATION EXCHANGE AND SOCIAL CHARACTER1

On interroge des individus sur l'image qu'ils se font d'eux-mêmes, l'image qu'ils désireraient donner d'eux-mêmes dans deux situations sociales distinctes (réunion amicale — entretien professionnel) et les traits d'autrui sur lesquels ils chercheraient, dans ces mêmes situations, à s'informer. Les AA. ont choisi des sujets qui sont représentatifs des types psycho-sociologiques de Riesman : étudiants de l'Inde méridionale (orientation traditionnelle); étudiants américains d'un collège exclusivement noir (orientation vers soi); étudiants américains d'un collège exclusivement blanc (orientation vers autrui). Pour se décrire eux-mêmes, les sujets indiens ont mis l'accent sur les origines démographiques, les noirs américains sur les traits de personnalité et les américains blancs sur les attitudes et opinions, ce qui est conforme aux hypothèses tirées du caractère dominant qu'ils représentent. On constate également que les Indiens changent de critères selon le type de situation évoquée, tandis que les Américains blancs changent très peu, les noirs américains se situant entre les deux.     

The cost of thinking about false beliefs: evidence from adults' performance on a non-inferential theory of mind task

Much of what we know about other people's beliefs comes non-inferentially from what people tell us. Developmental research suggests that 3-year-olds have difficulty processing such information: they suffer interference from their own knowledge of reality when told about someone's false belief (e.g., [Wellman, H. M., & Bartsch, K. (1988). Young children's reasoning about beliefs. Cognition, 30, 239-277.]). The current studies examined for the first time whether similar interference occurs in adult participants. In two experiments participants read sentences describing the real colour of an object and a man's false belief about the colour of the object, then judged the accuracy of a picture probe depicting either reality or the man's belief. Processing costs for picture probes depicting reality were consistently greater in this false belief condition than in a matched control condition in which the sentences described the real colour of one object and a man's unrelated belief about the colour of another object. A similar pattern was observed for picture probes depicting the man's belief in most cases. Processing costs were not sensitive to the time available for encoding the information presented in the sentences: costs were observed when participants read the sentences at their own pace (Experiment 1) or at a faster or a slower pace (Experiment 2). This suggests that adults' difficulty was not with encoding information about reality and a conflicting false belief, but with holding this information in mind and using it to inform a subsequent judgement.     

Effects of loading modes on densification efficiency of spark plasma sintering: sample study of zirconium carbide consolidation

Theoretical studies on the densification kinetics of the new spark plasma sinter-forging (SPS-forging) consolidation technique and of the regular SPS have been carried out based on the continuum theory of sintering. Both modelling and verifying experimental results indicate that the loading modes play important roles in the densification efficiency of SPS of porous ZrC specimens. Compared to regular SPS, SPS-forging is shown to be able to enhance the densification more significantly during later sintering stages. The derived analytical constitutive equations are utilised to evaluate the high-temperature creep parameters of ZrC under SPS conditions. SPS-forging and regular SPS setups are combined to form a new SPS hybrid loading mode with the purpose of reducing shape irregularity in the SPS-forged specimens. Loading control is imposed to secure the geometry as well as the densification of ZrC specimens during hybrid SPS process.     

From dating to mating and relating: Predictors of initial and long‐term outcomes of speed‐dating in a community sample

We studied initial and long‐term outcomes of speed‐dating over a period of 1 year in a community sample involving 382 participants aged 18–54 years. They were followed from their initial choices of dating partners up to later mating (sexual intercourse) and relating (romantic relationship). Using Social Relations Model analyses, we examined evolutionarily informed hypotheses on both individual and dyadic effects of participants' physical characteristics, personality, education and income on their dating, mating and relating. Both men and women based their choices mainly on the dating partners' physical attractiveness, and women additionally on men's sociosexuality, openness to experience, shyness, education and income. Choosiness increased with age in men, decreased with age in women and was positively related to popularity among the other sex, but mainly for men. Partner similarity had only weak effects on dating success. The chance for mating with a speed‐dating partner was 6%, and was increased by men's short‐term mating interest; the chance for relating was 4%, and was increased by women's long‐term mating interest. Copyright © 2010 John Wiley & Sons, Ltd.     

Reliability of implicit self‐esteem measures revisited

This study investigated the internal consistencies and temporal stabilities of different implicit self‐esteem measures. Participants (N = 101) responded twice—with a time lag of 4 weeks—to five different tasks: the Implicit Association Test (IAT), the Brief Implicit Association Test (BIAT), the Affective Priming Task (APT), the Identification‐Extrinsic Affective Simon Task (ID‐EAST) and the Name‐Letter Task (NLT). As expected, the highest reliability coefficients were obtained for the self‐esteem IAT. Importantly, the internal consistencies and the temporal stabilities of the APT, the ID‐EAST, and the NLT were substantially improved by using material, structural, and analytic innovations. In particular, the use of the adaptive response‐window procedure for the APT, the computation of error scores for the ID‐EAST, and the computation of a double corrected scoring algorithm for the NLT yielded reliability coefficients comparable to those of the established IAT. Implications for the indirect assessment of self‐esteem are discussed. Copyright © 2010 John Wiley & Sons, Ltd.     

The Social Relations Model: How to Understand Dyadic Processes

The social relations model (SRM) is an intriguing tool both to conceptualize and to analyze dyadic processes. We begin with explaining why interpersonal phenomena in everyday life are more complex than often considered. We then show how the SRM accounts for these complexities by decomposing interpersonal perceptions and behaviors into three independent components and describe the designs required to investigate these components. We then provide a step-by-step introduction into social relations analyses, thereby showing how the SRM can be used to investigate a multitude of exciting research questions. Finally, we summarize the existing software solutions for conducting social relations analyses. Resources for further information are suggested.