Directional learning,but no spatial mapping by rats performing a navigational task in an inverted orientation

Previous studies have identified neurons throughout the rat limbic system that fire as a function of the animal’s head direction (HD). This HD signal is particularly robust when rats locomote in the horizontal and vertical planes, but is severely attenuated when locomoting upside-down (Calton & Taube, 2005). Given the hypothesis that the HD signal represents an animal’s sense of directional heading, we evaluated whether rats could accurately navigate in an inverted (upside-down) orientation. The task required the animals to find an escape hole while locomoting inverted on a circular platform suspended from the ceiling. In Experiment 1, Long-Evans rats were trained to navigate to the escape hole by locomoting from either one or four start points. Interestingly, no animals from the 4-start point group reached criterion, even after 29 days of training. Animals in the 1-start point group reached criterion after about six training sessions. In Experiment 2, probe tests revealed that animals navigating from either 1- or 2-start points utilized distal visual landmarks for accurate orientation. However, subsequent probe tests revealed that their performance was markedly attenuated when navigating to the escape hole from a novel start point. This absence of flexibility while navigating upside-down was confirmed in Experiment 3 where we show that the rats do not learn to reach a place, but instead learn separate trajectories to the target hole(s). Based on these results we argue that inverted navigation primarily involves a simple directional strategy based on visual landmarks.     

The Integration of a Family Systems Approach for Understanding Youth Obesity,Physical Activity,and Dietary Programs

Rates of overweight in youth have reached epidemic proportions and are associated with adverse health outcomes. Family-based programs have been widely used to treat overweight in youth. However, few programs incorporate a theoretical framework for studying a family systems approach in relation to youth health behavior change. Therefore, this review provides a family systems theory framework for evaluating family-level variables in weight loss, physical activity, and dietary approaches in youth. Studies were reviewed and effect sizes were calculated for interventions that manipulated the family system, including components that targeted parenting styles, parenting skills, or family functioning, or which had novel approaches for including the family. Twenty-one weight loss interventions were identified, and 25 interventions related to physical activity and/or diet were identified. Overall, family-based treatment programs that incorporated training for authoritative parenting styles, parenting skills, or child management, and family functioning had positive effects on youth weight loss. Programs to improve physical activity and dietary behaviors that targeted the family system also demonstrated improvements in youth health behaviors; however, direct effects of parent-targeted programming is not clear. Both treatment and prevention programs would benefit from evaluating family functioning and parenting styles as possible mediators of intervention outcomes. Recommendations are provided to guide the development of future family-based obesity prevention and treatment programs for youth.     

Lumping versus splitting: A commentary on subtyping in OCD

This commentary discusses a number of pertinent concerns that were raised in this special series on subtyping in obsessive-compulsive disorders (OCD). The central question addressed in the three articles in the series is whether a better subtype classification of OCD could be developed if it is based on type of faulty cognition as well as symptom presentation. It is concluded that a more cognitive approach to OCD subtyping may not address many of the problems inherent in subtype research, nor will the development of special manualized treatment protocols for OCD subtypes necessarily yield significant improvements in treatment effectiveness. An alternative to OCD subtyping based on a categorical perspective is some form of profiling that recognizes the dimensional nature of OCD symptom and cognition variables.     

Effects of a group stereotype on memory for behaviors performed by a group member

Participants were provided with a group impression prior to receiving behavioral information pertaining to a group member. The group impression conveyed a below average level of intelligence or an above average level of intelligence. In addition, the distribution of intelligence scores within the group was unimodal in one condition and bimodal in another condition. The behavioral information pertaining to the individual group member was predominantly intelligent or predominantly unintelligent, thereby affording the on‐line formation of an intelligent or unintelligent personal impression regarding the group member. After receiving the behavioral information, participants recalled the behaviors and rated the group member along the intelligence dimension. Recall and judgment data revealed that the group impression functioned as the dominant expectancy that influenced processing of the behavioral information. Moreover, the effect of the group expectancy was substantially greater in the unimodal condition than in the bimodal condition. Presence of a group impression appears to reduce the tendency for participants to derive a personal impression on‐line, and reduce the tendency for participants to rely on a derived personal expectancy when encoding behaviors performed by a group member. Potential moderators of this effect are discussed. Copyright © 2005 John Wiley & Sons, Ltd.     

Psychological Correlates of Support for Compromise: A Polling Study of Jewish-Israeli Attitudes toward Solutions to the Israeli-Palestinian Conflict

A representative national sampling of Israeli Jewish adults (n = 550) reported attitudes toward solutions of the Israeli-Palestinian conflict that were salient in Israeli public discourse in 2002. Negative attitudes toward compromise were associated with zero-sum threat perceptions of the conflict with Palestinians, such that improvement for the Palestinian side can only come at the expense of the Israeli side. Positive attitudes toward compromise were associated with feelings of sympathy toward Palestinians, but, surprisingly, attitudes toward compromise were not associated with feelings of fear toward Palestinians. The possibility is advanced that it is fear of harm to the group, not fear of harm to self and family, that is related to willingness to compromise. Zero-sum perceptions of collective threat were not strongly related to affective reactions, and, contrary to a realist analysis of intergroup conflict, sympathy for Palestinians predicted support for compromise beyond what zero-sum perceptions of threat could predict.     

Semantic association of brand images at the implicit level: evidence from repetition blindness

A brand is designed to convey the uniqueness of its product and help differentiate it from competitors' offerings. However, consumers' shopping behaviour typically involves a minimum of effort with products being only scanned briefly. This study investigated the potential of exploiting a phenomenon known as semantic repetition blindness (SRB) to assess the implicit semantic association of brands. SRB occurs when only one of two conceptually related images is recalled from a sequence of items displayed in a rapid serial visual presentation. Using brand words and pictures, four product categories were tested for implicit conceptual categorization. Pictures of brands revealed SRB when brands of the same product category were presented. However, under the same conditions, brand words did not produce SRB. The importance of presenting brands in their familiar formats was also observed. The results indicate that this paradigm could be developed as a measure of implicit brand association and recognition. Copyright © 2005 John Wiley & Sons, Ltd.     

A Confirmatory Comparison of the Factor Structure of the Children's Depression Inventory between European American and African American Youth

We examined the factor structure of the Children's Depression Inventory (CDI) among a sample of 523 African American children (m age = 12.76) and a sample of 564 European American youth (m age = 12.43). Previous investigations have produced discrepant factor structures among samples of predominantly majority-culture children, but fewer investigations of the factor structure of the CDI have been conducted among non-European American samples. Confirmatory factor analyses of the original 5 factors identified by Kovacs (1983, 1991) revealed that the items had invariant measurement properties across the samples. The latent factor structure, however, revealed telling differences between the two samples. For European American youth, only one of the original five factors was meaningfully differentiated from the others, whereas for the African American youth, two of the factors clearly emerged as unique facets of depression. Consistent with other reports, between-group mean differences on the CDI and its factors were noted. We argue that further validation of the CDI among traditionally underserved populations is warranted. Predictive validation investigations, in particular, are needed to examine the relationship between CDI factor scores and clinical outcomes.     

DO PEOPLE REALLY ADAPT TO MARRIAGE?

Although cross-sectional studies have shown a reliable association between marital status and subjective well-being, a recent longitudinal study [Lucas et al. 2003, Journal of Personality & Social Psychology 84(3), pp.␣527–539] found no support for the idea that happiness increases after marriage. Instead, participants who got married reported short-term increases followed by complete adaptation back to baseline levels of well-being. However, researchers have criticized this study on two grounds. First, these results contradict cohort-based analyses from a nationally representative sample. Second, these analyses do not control for pre-marriage cohabitation, which could potentially inflate baseline levels of well-being. The original data (plus four additional waves) are reanalyzed to address these concerns. Results confirm that individuals do not get a lasting boost in life satisfaction following marriage.The data used in this paper were made available by the German Institute for Economic Research (DIW). This research was supported by a grant from the Anthony Marchionne Foundation.