Pairings of a Circular Alley with Apomorphine Produce Conditioned Hyperactivity

During training trials, some rats were injected with apomorphine as the unconditioned stimulus immediately before (Group Forward) or 15 min before (Group Backward) exposure to the conditioned stimulus, a circular alley where locomotor activity was measured for 30 min. Rats in the control condition (Group Unpaired) were not injected until 15 min after their removal from the alley. When the rats were later tested in the circular alley without prior administration of the drug, both Groups Forward and Backward were more active than Group Unpaired and thus showed conditioned hyperactivity. During a final test in which all the rats were injected with apomorphine prior to placement in the circular alley, Groups Forward and Backward showed greater apomorphine-induced hyperactivity than Group Unpaired. Although Group Forward was more active than Group Backward during both tests, these differences were not significant. These findings provide further evidence for the modulation of drug effects by Pavlovian conditioning.     

Experimental evaluation of a modular approach to mobilizing antitobacco influences of peers and parents

The experimental evaluation of two components of a community intervention to prevent adolescent tobacco use are described. Youth antitobacco activities (e.g., peer quizzes, sidewalk art, poster and T-shirt giveaways, etc.) and family communications activities (pamphlets to parents and student quizzes of parents) were evaluated in two time-series experiments, each of which was conducted in two experimental and one control community. Students in Grades 6 and 8 and their parents were assessed in a series of four phone surveys in the first experiment and six phone surveys in the second. Implementation of the youth antitobacco and family communications activities led to significantly greater exposure of young people to antitobacco information. They led to increases in parent and youth knowledge about tobacco use and more negative attitudes toward tobacco. In Experiment 2, youths in intervention communities had significantly lower rated intentions to smoke. The findings suggest the value of a modular approach to community interventions for influencing the social context relevant to the onset of adolescent tobacco use.     

Specific fears as predictors of generalized anxiety

Three hundred thirty-seven female undergraduates completed the Trait Form of the State-Trait Anxiety Inventory (STAI) and the Fear Survey Schedule-II (FSS) to determine if any specific fear factor was significantly related to STAI score. All fear factor scores and the total FSS-II score were significantly correlated with the STAI score and with each other. A stepwise regression procedure indicated that Factor 1, Fear of Social Interaction, accounted for 25.2% of the variance in STAI scores (p <.001), while Factor 4, of Negative Social Evaluation, accounted for an additional 1.8% of the variance (p <.01). The implications for theory, assessment, and intervention are discussed.     

Cognitive representation of personal stereotypes

A production task analogue of the traditional multiple choice trait checklist method was used to investigate stereotypes. Subjects were asked to supply rather than to select the most characteristic attributes of specified social groups. In a departure from tradition, stability of the content of stereotypes was analysed for personal stereotypes held by individuals rather than for social stereotypes shared by a cultural group. In contrast to the widely held belief that social stereotypes are fixed and unchanging, personal stereotypes were found to be only moderately stable over time. Only about two-fifths of the most characteristic attributes were duplicated in sessions separated by one week, and only about one-fifth of the most Characteristic attributes were duplicated in sessions separated by one-month or two-month intervals. Findings also supported the notion that general attributes, most characteristic attributes, and least characteristic attributes of a social category are not totally redundant and are represented quasi-independently in memory. Only about half of the most characteristic responses had also occurred on free response protocols and over half of the least characteristic responses tended not to be polar opposites of the most characteristic responses. It was the case, however, that with a production analogue of the multiple-choice trait checklist, trait-adjectives were the most frequent class of person information and accounted for between 50 and 60 per cent of the responses. However, eleven other classes of person information also occurred. Empirical results were applied toward a reexamination of the concepts of stereotype (data structure for the most characteristic attributes of a social group) and stereotyping (rigid procedures for processing data structures) and to a conceptual analysis of how stereotypes and social categories are structurally related.     

Cognitive "babyness": Developmental differences in the power of young children's supernatural thinking to influence positive and negative affect

Perceptions of maturational status may play an important role in facilitating caretaking and resources toward children expressing them. Previous work has revealed evidence that cues of cognitive immaturity foster positive perceptions in adults toward young children at a time during their lives when they are most dependent on adult care. In the current series of studies, the authors investigated when during development these biases emerge. They tested American and Spanish adolescents ranging from 10 to 17 years of age. Each participant rated a series of vignettes presenting different expressions of immature and mature thinking attributed to young children. Results revealed that older adolescents performed similarly to adults tested in previous studies (D. F. Bjorklund, C. Hernández Blasi, & V. A. Periss, 2010), rating positively expressions of supernatural thinking (e.g., animism) compared with other forms of immature cognition labeled as natural (e.g., overestimation). Both male and female participants 14 years and older favored children expressing the immature supernatural cognition on traits reflecting positive affect (e.g., endearing, likeable), while associating greater negative affect (e.g., sneaky, impatient with) with children expressing immature natural cognition. However, younger adolescents consistently rated all forms of immature thinking less positively than mature thinking, suggesting that a positive bias for some forms of immature thinking develops during adolescence. Based on an evolutionary developmental framework, the authors suggest that supernatural thinking may have a unique role in humans, fostering positive perceptions of young children in older adolescents (and adults) as they prepare themselves for the possible role of parenthood. (PsycINFO Database Record (c) 2012 APA, all rights reserved).     

Infant and adult perceptions of possible and impossible body movements: An eye-tracking study

This study investigated how infants perceive and interpret human body movement. We recorded the eye movements and pupil sizes of 9- and 12-month-old infants and of adults (N=14 per group) as they observed animation clips of biomechanically possible and impossible arm movements performed by a human and by a humanoid robot. Both 12-month-old infants and adults spent more time looking at the elbows during impossible compared with possible arm movements, irrespective of the appearance of the actor. These results suggest that by 12months of age, infants recognize biomechanical constraints on how arms move, and they extend this knowledge to humanoid robots. Adults exhibited more pupil dilation in response to the human's impossible arm movements compared with the possible ones, but 9- and 12-month-old infants showed no differential pupil dilation to the same actions. This finding suggests that the processing of human body movements might still be immature in 12-month-olds, as they did not show an emotional response to biomechanically impossible body movements. We discuss these findings in relation to the hypothesis that perception of others' body movements relies upon the infant's own sensorimotor experience.