Environmental stimulation, parental nurturance and cognitive development in humans

The effects of environmental stimulation and parental nurturance on brain development have been studied extensively in animals. Much less is known about the relations between childhood experience and cognitive development in humans. Using a longitudinally collected data set with ecologically valid in-home measures of childhood experience and later in-laboratory behavioral measures of cognitive ability, we were able to test hypotheses concerning the effects of environmental stimulation and parental nurturance. A double dissociation was found: On the one hand, there was a selective relation between parental nurturance and memory development, consistent with the animal literature on maternal buffering of stress hormone effects on hippocampal development. On the other hand, there was a selective relation between environmental stimulation and language development. The relevance of these findings to socioeconomic gradients in cognitive ability is discussed.     

The ecological rationality of delay tolerance: insights from capuchin monkeys

Both human and non-human animals often face decisions between options available at different times, and the capacity of delaying gratification has usually been considered one of the features distinguishing humans from other animals. However, this characteristic can widely vary across individuals, species, and types of task and it is still unclear whether it is accounted for by phylogenetic relatedness, feeding ecology, social structure, or metabolic rate. To disentangle these hypotheses, we evaluated temporal preferences in capuchin monkeys, South-American primates that, despite splitting off from human lineage approximately 35 million years ago, show striking behavioural analogies with the great apes. Then, we compared capuchins’ performance with that of the other primate species tested so far with the same procedure. Overall, capuchins showed a delay tolerance significantly higher than closely related species, such as marmosets and tamarins, and comparable to that shown by great apes. Capuchins’ tool use abilities might explain their comparatively high preference for delayed options in inter-temporal choices. Moreover, as in humans, capuchin females showed a greater delay tolerance than males, possibly because of their less opportunistic foraging style. Thus, our results shed light on the evolutionary origins of self-control supporting explanations of delay tolerance in terms of feeding ecology.     

Toward a More Complete Understanding of Bystander Willingness to Help: What Role Does Critical Consciousness Play?

Sexual assault is a common phenomenon on university campuses with about one in five women victimized while in college. Consequently, bystander intervention programs have been gaining momentum. To improve such programs, research has begun to identify factors that may facilitate or impede individuals’ willingness to help a potential victim of sexual assault. The current study adds to this literature by: (a) examining potential differences in rape myth acceptance, critical consciousness, and willingness to help based on types of self-reported exposure to sexual assault; (b) exploring the previously unexamined mediating role of critical consciousness in the relationship between exposure to sexual assault and willingness to help; and (c) clarifying how the extent of rape myth acceptance impacts the relationship between exposure to sexual assault and willingness to help. Using a sample of 511 U.S. undergraduate students, results generally demonstrated that those with multiple types of exposure to sexual assault victimization demonstrated the highest levels of critical consciousness and greater willingness to help. Additionally, there was both a significant indirect effect of exposure to sexual assault on willingness to help via critical consciousness and a conditional effect of exposure to sexual assault on willingness to help that was stronger at lower levels of rape myth acceptance. Results highlight the importance of programming targeted at increasing critical consciousness.

     

Oral administration of guanosine impairs inhibitory avoidance performance in rats and mice

Extracellular guanine-based purines, mainly the nucleoside guanosine, have recently been shown to exert neuroprotective effects, which seem to be related to antagonism of the glutamatergic system. In this study, we investigated the effects of acute oral administration of guanosine on inhibitory avoidance task in rats and mice. We also studied its effects on locomotor activity, anxiety-related behaviors and mechanisms of action involving the purinergic system. Guanosine (2.0 and 7.5mg/kg, per os), administered 75min pretraining, dose-dependently impaired retention of the inhibitory avoidance task in rats and mice, an effect not prevented by the adenosine receptor antagonist caffeine. Guanosine presented no effects on locomotor activity and anxiety-related behaviors. This amnesic effect of guanosine may be compatible with inhibition of glutamatergic system and seems to be not mediated by adenosine.     

Promoting Mental Health in Disadvantaged Preschoolers: A Cluster Randomized Controlled Trial of Teacher Training Effects

The literature provides solid documentation of the negative consequences of poor psychosocial functioning and behavioral problems in early childhood. Children facing economic disadvantage are at higher risk for poor socio-emotional development and problem behaviors, which draws attention to the need for prevention targeted at this risk group. The aim of our study was to analyze the impact of an evidence-based teacher-training program, the Incredible Years Teacher Classroom Management (IY-TCM), on the behavior of economically disadvantaged Portuguese children. Participants were 1030 children aged 3–6 years, from 65 preschool classrooms selected for their high percentage of children from economically disadvantaged backgrounds. The study followed an experimental randomized controlled between-group design, with pre- and post-intervention assessments. Teachers in the experimental group attended the IY-TCM program, implemented in six monthly workshops, and four sessions of individual in-class support. Children outcomes were evaluated with the Preschool and Kindergarten Behavior Scales—2nd Edition (Social Skills and Problem Behavior scales). After the intervention, preschoolers in the IY-TCM classrooms showed more improvements in their social skills and more decreases in problem behavior. Children with lower levels of social skills (high risk) at pre-intervention and those coming from families in economic need showed greater improvements in social skills, but these effects were not observed for problem behavior. Results support the growing evidence of the effectiveness of the IY-TCM as a stand-alone, non-adapted program in a Portuguese cultural context, which can play a protective role in children’s lives and thus bridge the gap between children coming from different economic backgrounds.     

Usage-based account of the acquisition of liaison: evidence from sensitivity to the singular/plural orientation of nouns

This study investigates whether children’s production and recognition of obligatory liaison sequences in French depend on the singular/plural orientation of nouns. Certain nouns occur more frequently in the plural (e.g., arbre “tree”), whereas others are found more often in the singular (e.g., arc-en-ciel “rainbow”). In the input, children more frequently encounter these plural-oriented nouns after determiners that indicate plurality (e.g., les,des “the”, deux “two”) and that are often associated with a /z/ liaison (e.g., deux arbres [døzarbr] “two trees”). In Experiment 1, 122 children (3 years 2 months to 6 years 3 months of age) were asked to produce nominal phrases with either /z/ liaisons (i.e., in plural contexts such as deux ours [døzurs] “two bears”) or /n/ liaisons (i.e., in singular contexts such as un ours [nurs] “one bear”). We found correlations between the plural orientation of the nouns and (a) the probability that they will be preceded by an incorrect /z/ liaison in the singular context and (b) the probability that they will be preceded by a correct /z/ liaison in the plural context. This result was, however, restricted to the younger children. In Experiment 2, 20 children (5 years 5 months to 6 years 3 months of age) were asked to monitor target words in auditorily presented sentences. The results showed shorter reaction times for singular-oriented nouns when preceded by a singular determiner than when preceded by a plural determiner. Conversely, plural-oriented nouns were responded to faster when preceded by a plural determiner than when preceded by a singular determiner. Results are discussed within the framework of a two-stage model of liaison acquisition recently proposed by Chevrot, Chabanal, and Dugua (Journal of French Language Studies,17 [2007] 103-128) as well as by Chevrot, Dugua, and Fayol (Journal of Child Language [in press]).     

The Pediatric Neuropsychologist Introduction to the Special Section

Abstract

The rapid expansion of clinical neuropsychology during the past decade has fostered increasing specialization in the practices of neuropsychologists. Recent surveys indicate that a small but significant number of neuropsychologists devote most of their professional activities to children and adolescents. The growing interest in pediatric and child-clinical neuropsychology is reflected most recently in the formation of the Pediatric Neuropsychology Interest Group (PNIG) in August 1995 and the subsequent establishment of an internet mailing list devoted to pediatric neuropsychology in October 1996. This new special section of Child Neuropsychology was created to foster increased communication and opinion exchange among the community of pediatric and child-clinical neuropsychologists regarding research, training, and clinical issues. In this inaugural section, we present a thoughtful discussion of training issues in pediatric neuropsychology. Future sections that are already planned will discuss the reporting of neuropsychological evaluations, and graduate and postdoctoral preparation for specializing in child neuropsychology. As Editors of the special section, we welcome and encourage additional contributions from readers regarding these or any other issues as they pertain to the growth and development of the profession of pediatric neuropsychology.     

Organizational Stress and Coping in U.S. Professional Soccer

The present study was an exploration of organizational stressors perceived by U.S. professional soccer players, and the coping strategies they employed to manage these stressors. Eight players (four female and four male) were interviewed during pre-season training camps. Results of data analysis revealed that contracts, draft, league and team structure, coach-athlete interaction, salaries, and travel demands were the most commonly cited areas of stress. Participants used avoidance, problem-focused, and social support coping strategies to manage these organizational stressors. In conclusion, more concern should be placed on the impact that organizational stressors can have on athletic performances.     

Incongruence of Sentence Completions under Time Pressure and Freedom

A direct relationship is hypothesized between amount of ego-alien content elicited by SC tests and amount of time pressure imposed. This prediction, tested with female college Ss, was supported by: (a) the results of two independent groups, one taking the test under time pressure and the other under freedom; (b) the results of a single group which was given the test under pressure and later under freedom, and those of a control group for whom the test was repeated under identical pressure conditions. Measures of incongruence within a given personality were obtained by assessing the dissimilarity of completions elicited under pressure and freedom. Anxious Ss showed a greater degree of incongruence than non-anxious Ss.