Functional magnetic resonance imaging study of Piaget's conservation-of-number task in preschool and school-age children: a neo-Piagetian approach

Jean Piaget’s theory is a central reference point in the study of logico-mathematical development in children. One of the most famous Piagetian tasks is number conservation. Failures and successes in this task reveal two fundamental stages in children’s thinking and judgment, shifting at approximately 7 years of age from visuospatial intuition to number conservation. In the current study, preschool children (nonconservers, 5-6 years of age) and school-age children (conservers, 9-10 years of age) were presented with Piaget’s conservation-of-number task and monitored by functional magnetic resonance imaging (fMRI). The cognitive change allowing children to access conservation was shown to be related to the neural contribution of a bilateral parietofrontal network involved in numerical and executive functions. These fMRI results highlight how the behavioral and cognitive stages Piaget formulated during the 20th century manifest in the brain with age.     

Belgrade systemic approach to the treatment of alcoholism: principles and interventions

This article describes an ecosystemic approach to alcoholism (ESTA) developed in Belgrade, Yugoslavia. The fundamental principle is that alcoholism is a problem of the whole context, involving the index patient, the family and wider systems including the work system.
The treatment programme, which integrates contemporary principles of the treatment of alcoholism with family-systems ideas covering biomedical-psychological-sociocultural levels, is also described and illustrated by a detailed case example.     

The Rolling 50s (and More): Cars and Life Satisfaction Among Seniors Across Europe

Applied Research in Quality of Life - Cars represent a valuable real asset that most individuals use on a daily basis. Although cars are a form of material prosperity like income and other forms of...     

The mental representation of the magnitude of symbolic and nonsymbolic ratios in adults

This study mainly investigated the specificity of the processing of fraction magnitudes. Adults performed a magnitude-estimation task on fractions, the ratios of collections of dots, and the ratios of surface areas. Their performance on fractions was directly compared with that on nonsymbolic ratios. At odds with the hypothesis that the symbolic notation impedes the processing of the ratio magnitudes, the estimates were less variable and more accurate for fractions than for nonsymbolic ratios. This indicates that the symbolic notation activated a more precise mental representation than did the nonsymbolic ratios. This study also showed, for both fractions and the ratios of dot collections, that the larger the components the less precise the mental representation of the magnitude of the ratio. This effect suggests that the mental representation of the magnitude of the ratio was activated from the mental representation of the magnitude of the components and the processing of their numerical relation (indirect access). Finally, because most previous studies of fractions have used a numerical comparison task, we tested whether the mental representation of magnitude activated in the fraction-estimation task could also underlie performance in the fraction-comparison task. The subjective distance between the fractions to be compared was computed from the mean and the variability of the estimates. This distance was the best predictor of the time taken to compare the fractions, suggesting that the same approximate mental representation of the magnitude was activated in both tasks.     

Imaging Brain Effects of APOE4 in Cognitively Normal Individuals Across the Lifespan

The ε4 allele of the apolipoprotein E (APOE4) is associated with an increased risk of developing Alzheimer’s disease (AD). Hence, several studies have compared the brain characteristics of APOE4 carriers versus non-carriers in presymptomatic stages to determine early AD biomarkers. The present review provides an overview on APOE4-related brain changes in cognitively normal individuals, focusing on the main neuroimaging biomarkers for AD, i.e. cortical beta-amyloid (Aβ) deposition, hypometabolism and atrophy. The most consistent findings are observed with Aβ deposition as most studies report significantly higher cortical Aβ load in APOE4 carriers compared with non-carriers. Fluorodeoxyglucose-positron emission tomography studies are rare and tend to show hypometabolism in brain regions typically impaired in AD. Structural magnetic resonance imaging findings are the most numerous and also the most discrepant, showing atrophy in AD-sensitive regions in some studies but contradicting results as well. Altogether, this suggests a graded effect of APOE4, with a predominant effect on Aβ over brain structure and metabolism. Multimodal studies confirm this view and also suggest that APOE4 effects on brain structure and function are mediated by both Aβ-dependent and Aβ-independent pathological processes. Neuroimaging studies on asymptomatic APOE4 carriers offer relevant information to the understanding of early pathological mechanisms of the disease, although caution is needed as to whether APOE4 effects reflect AD pathological processes, and are representative of these effects in non-carriers.     

The why and how of goal pursuits: Effects of global autonomous motivation and perceived control on emotional well-being

This study examined the effects of global autonomous motivation and global perceived control on young adults’ adaptive goal striving and emotional well-being. We reasoned that autonomously motivated participants who also perceive high levels of control would make accelerated progress with the pursuit of their most important goal and experience associated increases in emotional well-being. By contrast, we predicted that these benefits of autonomous motivation would be reduced among participants who perceive low levels of control. A 6-month longitudinal study of 125 college students was conducted, and self-reported global autonomous motivation, global perceived control, progress towards the most important goal, and emotional well-being were assessed. Regression analyses showed that the combination of high baseline levels of global autonomous motivation and global perceived control was associated with accelerated goal progress after 6 months, which mediated 6-month increases in emotional well-being. These benefits were not apparent among autonomously motivated participants who perceived low levels of control. The study’s findings suggest that global autonomous motivation and perceived control may need to work together to foster adaptive goal striving and emotional well-being.     

Perceived organizational support and employees’ well-being: the mediating role of organizational dehumanization

Perceived organizational support (POS) has been found to predict important organizational outcomes such as increasing employees’ well-being. In this research, we examine a new underlying mechanism of the relationship between POS and employees’ well-being, that is, employees’ perceptions that their organization dehumanizes them. This proposition was tested across two studies. Using an experimental design manipulating POS in a laboratory setting, Study 1 indicated that in the high POS condition, the subsequent feelings of being dehumanized by the organization were lower than in the low POS condition. More importantly, organizational dehumanization perceptions were found to mediate the POS condition and satisfaction link. Furthermore, using a sample of 1209 employees, results of Study 2 indicated that organizational dehumanization mediates the relationship between POS and three indicators of employees’ well-being (i.e., job satisfaction, emotional exhaustion, and psychosomatic strains). Implications for research on both organizational support theory and dehumanization theory are discussed.     

Rational learning and information sampling: on the "naivety" assumption in sampling explanations of judgment biases

Recent research has argued that several well-known judgment biases may be due to biases in the available information sample rather than to biased information processing. Most of these sample-based explanations assume that decision makers are "naive": They are not aware of the biases in the available information sample and do not correct for them. Here, we show that this "naivety" assumption is not necessary. Systematically biased judgments can emerge even when decision makers process available information perfectly and are also aware of how the information sample has been generated. Specifically, we develop a rational analysis of Denrell's (2005) experience sampling model, and we prove that when information search is interested rather than disinterested, even rational information sampling and processing can give rise to systematic patterns of errors in judgments. Our results illustrate that a tendency to favor alternatives for which outcome information is more accessible can be consistent with rational behavior. The model offers a rational explanation for behaviors that had previously been attributed to cognitive and motivational biases, such as the in-group bias or the tendency to prefer popular alternatives.     

Complementary variable- and person-centred approaches to the dimensionality of work engagement: a longitudinal investigation

This study illustrates complementary variable- and person-centred approaches to the investigation of the underlying dimensionality of the work engagement construct. A sample of 730 participants completed a questionnaire twice across a four-month period. The results showed that employees’ ratings of their work engagement simultaneously reflected a global overarching work engagement construct, which co-existed with three specific dimensions (vigour, dedication, and absorption). Relying on factor scores from this initial measurement model, the present study examined latent profiles of employees defined based on their global (work engagement) and specific (vigour, dedication, and absorption) levels of work engagement. The results revealed five distinct work engagement profiles, which proved to be fully identical, and highly stable, across the two time points. These profiles characterized disengaged-vigorous, normative, totally disengaged, vigorously absorbed, and engaged yet distanced employees. These profiles were also showed to be meaningfully related to employees’ levels of stress, intentions to leave the organization, health, and job satisfaction.     

The inverse fallacy: An account of deviations from Bayes’s theorem and the additivity principle

In judging posterior probabilities, people often answer with the inverse conditional probability--a tendency named the inverse fallacy. Participants (N = 45) were given a series of probability problems that entailed estimating both p(H / D) and p(approximately H / D). The findings revealed that deviations of participants' estimates from Bayesian calculations and from the additivity principle could be predicted by the corresponding deviations of the inverse probabilities from these relevant normative benchmarks. Methodological and theoretical implications of the distinction between inverse fallacy and base-rate neglect and the generalization of the study of additivity to conditional probabilities are discussed.