Encoding geometric and non-geometric information: a study with evolved agents

Vertebrate species use geometric information and non-geometric or featural cues to orient. Under some circumstances, when both geometric and non-geometric information are available, the geometric information overwhelms non-geometric cues (geometric primacy). In other cases, we observe the inverse tendency or the successful integration of both cues. In past years, modular explanations have been proposed for the geometric primacy: geometric and non-geometric information are processed separately, with the geometry module playing a dominant role. The modularity issue is related to the recent debate on the encoding of geometric information: is it innate or does it depend on environmental experience? In order to get insight into the mechanisms that cause the wide variety of behaviors observed in nature, we used Artificial Life experiments. We demonstrated that agents trained mainly with a single class of information oriented efficiently when they were exposed to one class of information (geometric or non-geometric). When they were tested in environments that contained both classes of information, they displayed a primacy for the information that they had experienced more during their training phase. Encoding and processing geometric and non-geometric information was run in a single cognitive neuro-representation. These findings represent a theoretical proof that the exposure frequency to different spatial information during a learning/adaptive history could produce agents with no modular neuro-cognitive systems that are able to process different types of spatial information and display various orientation behaviors (geometric primacy, non-geometric primacy, no primacy at all).     

The central amygdala projection to the substantia nigra reflects prediction error information in appetitive conditioning

The central amygdala nucleus (CeA) plays a critical role in cognitive processes beyond fear conditioning. For example, intact CeA function is essential for enhancing attention to conditioned stimuli (CSs). Furthermore, this enhanced attention depends on the CeA's connections to the nigrostriatal system. In the current study, we examined the role of the CeA's connections to two midbrain dopamine regions, the substantia nigra pars compacta (SNc) and the ventral tegmental area (VTA), in processing CS information when predictions of reward or nonreward were confirmed or disconfirmed. Initially, two different retrograde tracers were injected into the SNc and the VTA of rats, to label CeA cells. Different groups of rats then received a visual CS either paired or unpaired with food. Finally, Fos induction was assessed after a test session in which rats were exposed to the visual CS alone or paired with food. Colabeling of Fos and the retrograde tracer(s) showed that CeA neurons projecting to the SNc, but not to the VTA, were engaged in processing CS information when the training and testing conditions differed. These results suggest that the CeA-nigral pathway represents prediction error information during appetitive conditioning.     

Factors Associated with Providers’ Work Engagement and Burnout in Homeless Services: A Cross‐national Study

The complexity of homeless service users’ characteristics and the contextual challenges faced by services can make the experience of working with people in homelessness stressful and can put providers’ well‐being at risk. In the current study, we investigated the association between service characteristics (i.e., the availability of training and supervision and the capability‐fostering approach) and social service providers’ work engagement and burnout. The study involved 497 social service providers working in homeless services in eight different European countries (62% women; mean age = 40.73, SD = 10.45) and was part of the Horizon 2020 European study “Homelessness as Unfairness (HOME_EU).” Using hierarchical linear modeling (HLM), findings showed that the availability of training and supervision were positively associated with providers’ work engagement and negatively associated with burnout. However, results varied based on the perceived usefulness of the training and supervision provided within the service and the specific outcome considered. The most consistent finding was the association between the degree to which a service promotes users’ capabilities and all the aspects of providers’ well‐being analyzed. Results are discussed in relation to their implications for how configuration of homeless services can promote social service providers’ well‐being and high‐quality care.     

Measurement of External Shame: An Inside View

The aims of this study were to investigate the construct validity of the Other as Shamer scale (OAS) using confirmatory factor analysis (CFA) and to examine the psychometric properties of its Italian version in a sample of 687 nonclinical individuals. The CFA results indicated that the hypothesized hierarchical model (with 1 higher order factor and 3 first-order factors) was the best fitting solution. Cronbach's alpha indexes, as well as test–retest stability, provided satisfactory results. Correlations of the OAS total score and its subscales with the Beck Depression Inventory–II (rs = .30–.48) and the Teate Depression Inventory (rs = .32–.45) were both substantial and significant (p < .01). Receiver operating characteristic curves were constructed to indicate sensitivity and specificity of the OAS and its subscales when determining those nonclinical subjects who met clinical thresholds for depression symptoms. A series of cutoff scores for the OAS scale and its subscales was developed, with sensitivity values between .70 and .62, and specificity values between .71 and .62, indicating good to fair discrimination between the 2 groups (depressed vs. nondepressed). The theoretical and practical implications of these results were discussed.     

High school students' perceptions of AIDS risk: realistic appraisal or motivated denial?

We examined perceptions of risk for acquired immunodeficiency syndrome (AIDS) in 296 high school students living in or near a major urban center. We hypothesized that students with a dispositional tendency to deny threat would be more likely to misperceive their risk of contracting AIDS. Results indicated that study participants, overall, used their behaviors as a basis for assessing personal risk in the sense that they perceived higher risk when their behavior was in fact riskier. However, this relation did not hold for those students classified as repressors on a repression-sensitization scale; repressors' perceptions of absolute (but not comparative) risk were negatively correlated with degree of behavioral risk. In a secondary analysis, perceived absolute risk was found to be a significant predictor of intention to change AIDS-risk behaviors. This study provides support for a motivational interpretation of perceived invulnerability and has implications for the development of models of health behavior change.     

Learning strategy selection in the water maze and hippocampal CREB phosphorylation differ in two inbred strains of mice

Learning strategy selection was assessed in two different inbred strains of mice, C57BL/6 and DBA/2, which are used for developing genetically modified mouse models. Male mice received a training protocol in a water maze using alternating blocks of visible and hidden platform trials, during which mice escaped to a single location. After training, mice were required to choose between the spatial location where the platform had been during training (a place strategy) and a visible platform presented in a new location (a cued/response strategy). Both strains of mice had similar escape performance on the visible and hidden platform trials during training. However, in the strategy preference test, C57BL/6 mice selected a place strategy significantly more often than DBA/2 mice. Because much evidence implicates the hippocampus and striatum as important neural substrates for spatial/place and cued/response learning, respectively, the engagement of the hippocampus was then assessed after either place or cue training by determining levels of cAMP response element-binding protein (CREB) and phosphorylated CREB (pCREB) in these two mouse strains. Results revealed that hippocampal CREB levels in both strains of mice were significantly increased after place in comparison to cued training. However, the relation of hippocampal pCREB levels to training was strain dependent; pCREB was significantly higher in C57BL/6 mice than in DBA/2 mice after place training, while hippocampal pCREB levels did not differ between strains after cued training. These findings indicate that pCREB, specifically associated with place/spatial training, is closely tied to differences in spatial/place strategy preference between C57BL/6 and DBA/2 mice.     

Identifying violence among women patients attending family practices: the role of research in community change

Violence against women has serious consequences. Although victims use health facilities more frequently than others, violence is still not recognized in most services and in the larger community. This study had three aims: (1) to estimate the prevalence of violence among women patients in primary care, (2) to evaluate the feasibility of asking all women about violence, and (3) to make violence visible, and thereby initiate a process of professional and community change on the issue of violence against women. The study was carried out in a small Italian town, at the initiative of a local family doctor. We conducted a cross‐sectional survey among patients of six family practices and 444 women responded to a self‐administrated questionnaire. Five per cent of respondents experienced physical or sexual violence in the last year, and 25% had experienced it in the past. Nineteen per cent had experienced psychological violence in the last 12 months. Risk factors for current violence were: younger age, being pregnant or with young children, being separated or divorced, or lack of stable employment. Most women were in favour of being asked about violence by their doctor. The study's results were disseminated in public meetings, with good press coverage. This resulted in a dramatic increase in the visibility of victims of violence, the development of a training course for health professionals, and the creation of the first women's group in the town. Along with advocacy work, the group has prepared a booklet on violence addressing women, and is now raising funds to start an ‘anti‐violence’ telephone line. Overall, the study has become a tool for change within the health services and the community. Copyright © 2004 John Wiley & Sons, Ltd.     

A Pilot Study Implementing Coping Power in Italian Community Hospitals: Effect of Therapist Attachment Style on Outcomes in Children

The study presented the initial report of a project regarding the implementation of the Coping Power Program in Italian community hospitals, and the program’s ability to reduce externalizing behavioral problems in children with a Disruptive Behavior Disorder diagnosis. Usually, interventions for children are implemented by a number of therapists with different personal characteristics, which therefore influence the implementation quality of an intervention. That said, the present study aimed to establish whether the insecure attachment styles of therapists predict unfavorable outcomes for children treated with the Coping Power Program. The sample included 80 children with a Disruptive Behavior Disorder diagnosis and 16 therapists. The results showed that the change in children’s aggressive behavioral problems was significantly related to the levels of the therapist’s preoccupation with relationships. Higher levels of change in aggression (where a higher value means that the aggression at the end of the treatment is higher than aggression at the baseline evaluation) are associated with higher levels of therapist’s preoccupied attachment style (anxious attachment style). This study provided some preliminary evidence that therapists need to be sensitive to their own attachment experiences when delivering therapy for children.     

Day-Hospital Multifocal Integrated Treatment for Anorexia Nervosa in Adolescents: A One-Year Follow-Up

The current guidelines for treatment of Anorexia Nervosa (AN) in children and adolescents recommend an integrated multidisciplinary approach as the elective intervention for this disorder. Nevertheless, there is insufficient evidence on the results of an integrated approach for the treatment of AN adolescent patients, especially in a Hospital setting. This study aims to analyze clinical and psychological changes occurring in adolescent patients after completion of a Day-Hospital Multifocal Integrated Treatment (MIT) for Anorexia Nervosa. The sample consisted of 60 adolescents with AN or Eating Disorder Not Otherwise Specified (EDNOS) restrictive type, aged 11 to 18 years, and their parents. Clinical course was evaluated at 3, 6 and 12-month follow-up periods. Our results showed clinical remission in a good percentage of patients. In general, we found a significant reduction of the eating psychopathology, whereas we did not detect any significant improvement in body dissatisfaction, perfectionism, and relational difficulties. This positive trend was confirmed at 3, 6, and 12-month follow-up, despite the increase of drop-outs. These results suggest that the proposed treatment is reasonably effective, because it aims to contain and reduce the acute phase of the disease in a limited time and in a hospital setting, but it is necessary to continue the treatment with targeted psychotherapeutic interventions to address the deeper psychological discomfort underlying the eating disorder.