Linking major depression and the neural substrates of associative processing

It has been proposed that mood correlates with the breadth of associative thinking. Here we set this hypothesis to the test in healthy and depressed individuals. Generating contextual associations engages a network of cortical regions including the parahippocampal cortex (PHC), retrosplenial complex, and medial prefrontal cortex. The link between mood, associative processing, and its underlying cortical infrastructure provides a promising avenue for elucidating the mechanisms underlying the cognitive impairments in major depressive disorder (MDD). The participants included 15 nonmedicated individuals with acute major depressive episodes and 15 healthy matched controls. In an fMRI experiment, participants viewed images of objects that were either strongly or weakly associated with a specific context (e.g., a beach chair vs. a water bottle) while rating the commonality of each object. Analyses were performed to examine the brain activation and structural differences between the groups. Consistent with our hypothesis, controls showed greater activation of the contextual associations network than did depressed participants. In addition, PHC structural volume was correlated with ruminative tendencies, and the volumes of the hippocampal subfields were significantly smaller in depressed participants. Surprisingly, depressed participants showed increased activity in the entorhinal cortex (ERC), as compared with controls. We integrated these findings within a mechanistic account linking mood and associative thinking and suggest directions for the future.     

Cognitive and social-communication abilities among young children conceived by assisted reproductive technologies

Assisted reproductive technologies (ART) lack biological filters that are part of the natural fertilization process and thus might enable the presence of abnormal genetic materials. Whereas the findings regarding neonatal and neurological risks among ART-conceived children are rather consistent, data regarding cognitive and social-emotional developmental outcomes are inconsistent. The aim of this study was to examine the association between ART and cognitive and social-communication outcomes among pre-school children. The results indicated that the cognitive and social-communicative abilities of the ART-conceived children were similar to those of the spontaneously conceived children; however, according to parental reports, children in the ART group had higher communicative skills and better motor abilities than spontaneously conceived children. These results should be interpreted with caution as we used measures that assess global cognitive abilities that may not be sensitive to more subtle differences of higher cognitive and social-communication abilities in infancy that may become more prominent later in life. Although infertile couples and professionals in the field of ART can be reassures by the current findings, further research is needed as well as follow-up evaluation of this population during school age.     

Level of Education and Category Fluency Task among Spanish Speaking Elders: Number of Words,Clustering, and Switching Strategies

ABSTRACT

It has been well documented that education influences the individual's performance on category fluency tasks but it is still unclear how this effect may differ across the different types of category tasks (i.e., animals, fruits, vegetables and clothing). This study aims (1) to analyze the effect of the level of education on four different types of category fluency tasks among elder Hispanic Americans and (2) to provide normative information on a population with different education levels that was previously screened for neurological and psychiatric conditions. In addition this study examines the semantic strategies used by these individuals to complete the fluency tasks. The sample included 105 healthy Hispanic individuals (age 55–98; 29 males and 76 females) divided into three education groups (<6, 6–11 and >11 years of education). Results showed that after controlling for age and gender, education has a main effect and is a strong predictor of performance in verbal fluency for the categories animals and clothing with increasing educational attainment being associated with higher category fluency scores and with more switches between categories. These findings suggest that the category fruit is less influenced by level of education than the other three semantic categories and may be a more appropriate test across different educational groups. Results from this study provide a reference for clinicians assessing verbal fluency in Spanish speaking populations.     

Richelieu in Arabic: The Catholic Printed Message to the Orient in the Seventeenth Century1

Throughout most of the seventeenth century, the printer and publisher Antoine Vitré dominated the printing of Arabic in Paris. He produced mainly religious texts, intended for use by missionaries in the Orient. One of these books was the Arabic translation of Cardinal Richelieu's famous catechism Instruction du Chrétien. This article looks at the story behind the preparation of the Arabic edition, its printing, and its use by missionaries. It explores the role written texts played in conveying a religious message to an essentially illiterate society. In addition, it uses the story of Richelieu's text in Arabic to attempt to explain why Middle Eastern societies declined to adopt mass printing before the nineteenth century, even though there were apparently no interdictions against its implementation.     

Hemispheric asymmetries in semantic processing: evidence from false memories for ambiguous words

We used fMRI to investigate competition during language production in two word production tasks: object naming and color naming of achromatic line drawings. Generally, fMRI activation was higher for color naming. The line drawings were followed by a word (the distractor word) that referred to either the object, a related object, or an unrelated object. The effect of the distractor word on the BOLD response was qualitatively different for the two tasks. The activation pattern suggests two different kinds of competition during lexical retrieval: (1) Task-relevant responses (e.g., red in color naming) compete with task-irrelevant responses (i.e., the object’s name). This competition effect was dominant in prefrontal cortex. (2) Multiple task-relevant responses (i.e., target word and distractor word) compete for selection. This competition effect was dominant in ventral temporal cortex. This study provides further evidence for the distinct roles of frontal and temporal cortex in language production, while highlighting the effects of competition, albeit from different sources, in both regions.     

Antecedents of mirror self‐recognition of toddlers: Emotional availability,birth order,and gender

The present study employed a longitudinal design for examining the role of emotional availability of child–mother dyads, birth order of children, and their gender as determinants of mirror self‐recognition of toddlers. It was hypothesized that toddlers who maintained more optimal emotional availability with mother at the age of 12 months would tend to identify themselves more readily at the age of 20 months. We assumed further that first‐born children and females would identify themselves more readily than males and younger siblings. A sample of 54 nonrisk children and their mothers was investigated. Path analysis model showed that emotional availability partly predicted self‐recognition: responsive toddlers identified themselves more often than less responsive peers. No significant effects were found for the other scales of emotional availability. A nonlinear birth order effect was observed, with second‐born children being less likely to show mirror self‐recognition than first‐borns or third‐borns. Child gender was not significantly associated with self‐recognition at the age of 20 months. The data showed further that birth order was significantly linked with components of emotional availability. No significant correlations were found between emotional availability scores and child gender. Results were discussed in light of the different components of emotional availability, and the psychological correlates of ordinal position in the family. ©2002 Michigan Association for Infant Mental Health.     

The relationship of work stressors and emotional support to strain in police officers

This study tested whether quantity and quality of social support and two sources of work stress (organizational stressors and job risk) predicted work strain in police officers, a high-risk occupational group. The participants were 135 police officers from a large metropolitan law enforcement agency who responded to questionnaires for assessing work stress, social support, exhaustion, and other strain symptoms. Emotional support and work stressors accounted directly for significant variance in emotional exhaustion, depersonalization, and symptom frequency. Conflicted relationships, which are a source of both work stress and support, also contributed to strain. In contrast to previous findings, a reverse buffering effect for social support did not contribute to predicting strain. Stress management programs for police and other high-stress occupations should target increasing emotional support from supervisors and peers, and reducing conflict in job and family relationships.     

Being the same and different: A model explaining new product adoption

• The study suggests an alternative conceptualization for understanding adoption behavior over time, based on Optimal Distinctiveness Theory. This theory states that social identity derives from a fundamental tension between human needs for validation and similarity to others—the need for assimilation—and a countervailing need for uniqueness and individuation—the need for differentiation. The present study proposes that the effect of the size of the group of consumers who have already adopted a new product on an individual consumer's decision to adopt this product is contingent upon the consumer's two predispositions: the need for assimilation and the need for distinctiveness. Results of empirical research suggested that differently perceived subgroup sizes fulfill consumers' dual needs for distinctiveness and assimilation differently. The influence of the adopters' group size on a consumer's decision to adopt a new product varied among individuals with different levels of needs for distinctiveness and assimilation: when need for distinctiveness was low, the higher was the need for assimilation and the larger was the perceived group size, the higher was the probability of adopting the product. When the need for distinctiveness was high, the lower was the need for assimilation and the larger was the perceived group size, the lower was the probability of adopting the product. In addition, when the need for both distinctiveness and assimilation were high, the probability of adopting the product rose as the perceived group size increased. Implications for product variation, marketing communication, and target groups are discussed.

Copyright © 2008 John Wiley & Sons, Ltd.     

Social loafing vs. social enhancement: Public goods provisioning in real-time with irrevocable commitments

Whereas most experimental studies of public goods provisioning require that all players make their decisions simultaneously, in most organizational settings contribution decisions are made in real time. To account for this aspect of the decision process, we introduce a real-time protocol of play in which, at any point in time, players can either withhold or contribute their entire endowment to a step-level public good. Once contributed, the individual endowments—that in the present experiment differ from one group member to another—cannot be withdrawn. Our results show that contribution levels under the real-time protocol with irrevocable commitments significantly exceed those observed in previous studies under the more common simultaneous protocol of play, thereby considerably reducing social loafing (free riding). Consistent with our equilibrium analysis, over multiple iterations of the game play converges to an equilibrium set of players who maximize the sum of their individual benefit-to-contribution ratios.