Attentional bias for body and food in eating disorders: increased distraction, speeded detection, or both?

Previous research suggests that eating disorder patients show an attentional bias for body- and food-related information. However, so far little is known about the mechanisms that underlie the attentional favoring of this particular information in eating disorder patients. In the present study, we used both a body and a food visual search task to study speeded detection and increased distraction in eating disorder patients (n=67) and healthy controls (n=60). Compared with controls, eating disorder patients showed evidence of speeded detection of body-related information, and increased distraction by food information. These results suggest that the mechanism underlying the biased attentional allocation of eating disorder patients varies, and is dependent upon the type of information they are presented with.     

Children's knowledge of the earth: a new methodological and statistical approach

In the field of children’s knowledge of the earth, much debate has concerned the question of whether children’s naive knowledge—that is, their knowledge before they acquire the standard scientific theory—is coherent (i.e., theory-like) or fragmented. We conducted two studies with large samples (N = 328 and N = 381) using a new paper-and-pencil test, denoted the EARTH (EArth Representation Test for cHildren), to discriminate between these two alternatives. We performed latent class analyses on the responses to the EARTH to test mental models associated with these alternatives. The naive mental models, as formulated by Vosniadou and Brewer, were not supported by the results. The results indicated that children’s knowledge of the earth becomes more consistent as children grow older. These findings support the view that children’s naive knowledge is fragmented.     

Justification of Violence and Grandiosity Schemas as Predictors of Antisocial Behavior in Adolescents

This study assessed the role of grandiosity and justification of violence cognitive schemas as predictors of adolescents’ antisocial behavior. The 974 Spanish adolescents (457 girls and 517 boys, aged between 14 and 18 years) were assessed at the beginning of the school year and at follow-up 6 months later. They completed measures of aggressive behavior and delinquent behavior, justification of violence and grandiosity cognitive schemas, and impulsivity. The results showed that grandiosity and justification of violence schemas predicted both aggressive and delinquent behavior 6 months later and that the association between grandiosity and aggressive behavior was moderated by impulsivity in boys. In general, the influence of the cognitive schemas in antisocial behavior was very similar for boys and girls. However, boys showed higher delinquent behavior rates than did girls and the tests of mediation revealed that this difference was partially accounted for by boys’ higher scores in grandiosity and justification of violence.     

The role of individual and community normative factors: a multilevel analysis of contraceptive use among women in union in Mali

CONTEXT: Unlike in other African countries, the fertility rate in Mali has remained at a relatively high rate of 6.8 births per woman. Little research exists on the role that community norms play in use of family planning, particularly in low-prevalence countries. METHODS: Data on 7,671 women in union from the 2001 Mali Demographic and Health Survey were analyzed using multilevel modeling techniques to assess the effects of individual and community factors on the adoption of modern contraceptive methods. RESULTS: Only 5% of women in union were using a modern contraceptive method in 2001. The odds of contraceptive use were elevated among women in the highest wealth quintile, women who approved and whose partner approved of family planning, those who had had recent discussions on family planning with their partner or others and those exposed to family planning messages (odds ratios, 1.4-2.7). At the community level, the odds of modern contraceptive use rose with the proportion of women who were exposed to family planning messages (5.5), and decreased as the mean number of births per woman rose (0.7). In the final model, which included both individual- and community-level factors, the community factors were no longer significant. CONCLUSIONS: Because approval of family planning and discussion of family planning with partners were shown to be the factors most strongly associated with modern contraceptive use in the multilevel model, programs that seek to increase individual approval and those that teach communication between partners could be particularly helpful to increasing contraceptive use in Mali.     

Change detection: evidence for information accumulation in flicker paradigms

Change detection in rapidly alternating pictures separated by a blank frame has been shown to be very difficult (e.g., [Rensink, R. A., O'Regan, J. K., & Clark, J. J. (1997). To see or not to see: The need for attention to perceive changes in scenes. Psychological Science, 8, 368-373]). The three experiments reported here focus on the mechanism behind detection. More specifically, we explored whether information about the stimulus material accumulates in visual memory and thereby improves change detection. For that purpose the first experiment varied the number of repetitions of the original and modified stimulus version. Results showed that detection improved with more repetitions. The second experiment demonstrated that repetition performance improved more when both the original and the modified picture were repeated. Finally, the third experiment strengthened these findings by showing poorer detection performance when the repetition sequence was randomized. Together, our findings suggest accumulation of information in memory over picture presentations and moreover improved performance when both picture types were repeated. These results underline the importance of developing representations for both picture versions in change detection.     

Gustatory plasticity in C. elegans involves integration of negative cues and NaCl taste mediated by serotonin, dopamine, and glutamate

While na?ve Caenorhabditis elegans individuals are attracted to 0.1-200 mM NaCl, they become strongly repelled by these NaCl concentrations after prolonged exposure to 100 mM NaCl. We call this behavior gustatory plasticity. Here, we show that C. elegans displays avoidance of low NaCl concentrations only when pre-exposure to NaCl is combined with a negative stimulus, e.g., a repellent, or in the absence of food. By testing serotonin and/or dopamine signaling mutants and rescue by exogenously supplying these neurotransmitters, we found that serotonin and dopamine play a role during the plasticity response, while serotonin is also required during development. In addition, we also show that glutamate plays an important role in the response to NaCl, both in chemoattraction to NaCl and in gustatory plasticity. Thus, C. elegans can associate NaCl with negative stimuli using dopaminergic, serotonergic, and glutamatergic neurotransmission. Finally, we show that prolonged starvation enhances gustatory plasticity and can induce avoidance of NaCl in most gustatory plasticity mutants tested. Only mutation of the glutamate-gated Cl(-) channel gene avr-15 affected starvation-enhanced gustatory plasticity. These results suggest that starvation induces avoidance of NaCl largely independent of the normal gustatory plasticity mechanism.     

The influence of juggling on mental rotation performance in children with spina bifida

This study examined the influence of juggling training on mental rotation ability in children with spina bifida. Children between the ages of 8 and 12 solved a chronometric mental rotation test. Half of the children received juggling training (EG) over an 8week time period; the other half did not receive training (CG). Afterwards, all participants completed the mental rotation test again. Children of the EG showed a significant decrease in reaction time and an increase in mental rotation speed compared to the control group. This indicates that juggling improves the rotation in the mental rotation process in children with spina bifida.     

Dealing with deviants: The effectiveness of rejection,denial, and apologies on protecting the public image of a group

Public transgressions by group members threaten the public image of a group when outside observers perceive them as representative of the group in general. In three studies, we tested the effectiveness of rejection of a deviant group member who made a racist comment in public, and compared this to several other strategies the group could employ to protect their image. In Study 1 (N = 75) and Study 2 (N = 51), the group was judged less racist after rejecting the deviant than after claiming a non‐racist position or not responding to the transgression. Perceived typicality of the deviant partially mediated this effect in Study 2. In Study 3 (N = 81), the group was judged least racist after forcing the deviant to apologize and as most racist after denying the severity of the transgression. Results also showed a negative side‐effect of rejection. Perceived exclusion of the deviant contributed to a perception of the group as disloyal to its members, which resulted in a less favorable overall group evaluation. Potential benefits and risks of rejection, denial, and apologies are further discussed in the General Discussion. Copyright © 2009 John Wiley & Sons, Ltd.