The development of executive function in early childhood is inversely related to change in body mass index: Evidence for an energetic tradeoff?

A well‐established literature demonstrates executive function (EF) deficits in obese children and adults relative to healthy weight comparisons. EF deficits in obesity are associated with overeating and impulsive consumption of high calorie foods leading to excess weight gain and to problems with metabolic regulation and low‐grade inflammation that detrimentally affect the structure and function of prefrontal cortex. Here, we test a complementary explanation for the relation between EF and body mass index (BMI) grounded in the energy demand of the developing brain. Recent work shows that the brain accounts for a lifetime peak of 66% of resting metabolic rate in childhood and that developmental changes in brain energetics and normative changes in body weight gain are closely inversely related. This finding suggests a trade‐off in early childhood between energy used to support brain development versus energy used to support physical growth and fat deposition. To test this theorized energetic trade‐off, we analyzed data from a large longitudinal sample (N = 1,292) and found that change in EF from age 3 to 5 years, as a proxy for brain development in energetically costly prefrontal cortex, is inversely related to change in BMI from age 2 to 5 years. Greater linear decline in BMI predicted greater linear increase in EF. We interpret this finding as tentative support for a brain–body energetic trade‐off in early childhood with implications for lifetime obesity risk.     

What's mom got to do with it? Contributions of maternal executive function and caregiving to the development of executive function across early childhood

Executive functions (EFs; e.g. working memory, inhibitory control) are mediated by the prefrontal cortex and associated with optimal cognitive and socio‐emotional development. This study provides the first concurrent analysis of the relative contributions of maternal EF and caregiving to child EF. A group of children and their mothers (n = 62) completed age‐appropriate interaction (10, 24, 36 months) and EF tasks (child: 24, 36, and 48 months). Regression analyses revealed that by 36 months of age, maternal EF and negative caregiving behaviors accounted for unique variance in child EF, above and beyond maternal education and child verbal ability. These findings were confirmed when using an early child EF composite‐our most reliable measure of EF – and a similar pattern was found when controlling for stability in child EF. Furthermore, there was evidence that maternal EF had significant indirect effects on changes in child EF through maternal caregiving. At 24 months, EF was associated with maternal EF, but not negative caregiving behaviors. Taken together, these findings suggest that links between negative caregiving and child EF are increasingly manifested during early childhood. Although maternal EF and negative caregiving are related, they provide unique information about the development of child EF. A video abstract of this article can be viewed at http://www.youtube.com/watch?v=NPKXFbbrkps     

Cultural differences in self‐recognition: the early development of autonomous and related selves?

Fifteen‐ to 18‐month‐old infants from three nationalities were observed interacting with their mothers and during two self‐recognition tasks. Scottish interactions were characterized by distal contact, Zambian interactions by proximal contact, and Turkish interactions by a mixture of contact strategies. These culturally distinct experiences may scaffold different perspectives on self. In support, Scottish infants performed best in a task requiring recognition of the self in an individualistic context (mirror self‐recognition), whereas Zambian infants performed best in a task requiring recognition of the self in a less individualistic context (body‐as‐obstacle task). Turkish infants performed similarly to Zambian infants on the body‐as‐obstacle task, but outperformed Zambians on the mirror self‐recognition task. Verbal contact (a distal strategy) was positively related to mirror self‐recognition and negatively related to passing the body‐as‐obstacle task. Directive action and speech (proximal strategies) were negatively related to mirror self‐recognition. Self‐awareness performance was best predicted by cultural context; autonomous settings predicted success in mirror self‐recognition, and related settings predicted success in the body‐as‐obstacle task. These novel data substantiate the idea that cultural factors may play a role in the early expression of self‐awareness. More broadly, the results highlight the importance of moving beyond the mark test, and designing culturally sensitive tests of self‐awareness.     

Temperament in early childhood and peer interactions in third grade: The role of teacher–child relationships in early elementary grades

Children's interactions with peers in early childhood have been consistently linked to their academic and social outcomes. Although both child and classroom characteristics have been implicated as contributors to children's success, there has been scant research linking child temperament, teacher–child relationship quality, and peer interactions in the same study. The purpose of this study is to examine children's early temperament, rated at preschool age, as a predictor of interactions with peers (i.e., aggression, relational aggression, victimization, and prosociality) in third grade while considering teacher–child relationship quality in kindergarten through second grades as a moderator and mediator of this association. The sample (N = 1364) was drawn from the NICHD Study of Early Child Care and Youth Development. Results from structural equation models indicated that teacher–child conflict in early elementary grades mediated links between children's temperament and later peer interactions. Findings underscore the importance of considering children's temperament traits and teacher–child relationship quality when examining the mechanisms of the development of peer interactions.     

Sex differences and parallels in the development of externalizing behaviours in childhood: Boys’ and girls’ susceptibility to social preference among peers

This study examined whether being poorly preferred by peers may partially explain why boys with oppositional behaviour develop more conduct problems than girls. Children from the general Dutch population attending regular elementary schools (N = 759, 50.3% boys) were followed annually from age 7 to 10 years. Teachers-rated externalizing behaviour and peer-nominated social preference was assessed across four waves. Autoregressive cross-lagged models indicated that oppositionality predicted increases in conduct problems. Above and beyond this direct link, oppositionality predicted low social preference in subsequent years, which in turn predicted an increase in conduct problems. In this latter pathway, sex differences were found. That is, oppositional boys were as likely as oppositional girls to show an increase in low social preference one year later. However, boys who had low social preference scores showed stronger increases in conduct problems one year later, compared to girls who had low social preference scores. Hence, developmental models of externalizing behaviour should consider the possible sex-differential impact of troublesome peer-relationships to understand the development of milder to more severe externalizing behaviours.     

Latent change models of adult cognition: are changes in processing speed and working memory associated with changes in episodic memory?

The authors used 6-year longitudinal data from the Victoria Longitudinal Study (VLS) to investigate individual differences in amount of episodic memory change. Latent change models revealed reliable individual differences in cognitive change. Changes in episodic memory were significantly correlated with changes in other cognitive variables, including speed and working memory. A structural equation model for the latent change scores showed that changes in speed and working memory predicted changes in episodic memory, as expected by processing resource theory. However, these effects were best modeled as being mediated by changes in induction and fact retrieval. Dissociations were detected between cross-sectional ability correlations and longitudinal changes. Shuffling the tasks used to define the Working Memory latent variable altered patterns of change correlations.     

The development of expert face processing: are infants sensitive to normal differences in second-order relational information?

Sensitivity to second-order relational information (i.e., spatial relations among features such as the distance between eyes) is a vital part of achieving expertise with face processing. Prior research is unclear on whether infants are sensitive to second-order differences seen in typical human populations. In the current experiments, we examined whether infants are sensitive to changes in the space between the eyes and between the nose and the mouth that are within the normal range of variability in Caucasian female faces. In Experiment 1, 7-month-olds detected these changes in second-order relational information. Experiment 2 extended this finding to 5-month-olds and also found that infants detect second-order relations in upright faces but not in inverted faces, thereby exhibiting an inversion effect that has been considered to be a hallmark of second-order relational processing during adulthood. These results suggest that infants as young as 5 months are sensitive to second-order relational changes that are within the normal range of human variability. They also indicate that at least rudimentary aspects of face processing expertise are available early in life.     

Assumptions of infantile amnesia: are there differences between early and later memories?

Most adults are able to provide few, if any, reports of autobiographical memories from the first years of life. Early memories that do exist have been characterised as highly emotional, containing an abundance of perceptual as opposed to propositional information, and more often in the third than the first person perspective. These qualities figure prominently in theories of the source of the phenomenon of infantile amnesia. However, early and later memories have not been directly compared with regard to these features. In the present research, we compared early and later memories in the same individuals, with the same methodology. Results indicated few objective differences between the early and later memories of women (Experiment 1) and men (Experiment 2). The findings are discussed in light of their implications for theories as to the source of infantile amnesia.     

Willing and able? Theory of mind,social motivation,and social competence in middle childhood and early adolescence

This study investigated the links between theory of mind, social motivation, and children's social competence in middle childhood and early adolescence. Two hundred and sixty four children (136 girls, 128 boys) aged between 8 and 13 years (M Age = 10.88 years, SD = 1.45) completed theory-of-mind tests and self-report questionnaires measuring social motivation. Teachers rated children's social competence at school. Teacher-rated social competence was associated with individual differences in both theory of mind and children's motivation to develop and maintain social relationships. Results suggest that while individual differences in social motivation and theory of mind are partially overlapping, both theory of mind ability and social motivation contribute to successful social interaction at school.     

Do you "want" to play? Distinguishing between conflicted shyness and social disinterest in early childhood

This study attempted to distinguish two types of social withdrawal in early childhood: (a) one based on social fear and anxiety despite a desire to interact socially (conflicted shyness) and (b) one based on the lack of a strong motivation to engage in social interaction (social disinterest). Two samples of preschoolers (n = 119 and n = 127) 3-5 years of age participated. Their mothers completed the newly developed Child Social Preference Scale, which was designed to assess conflicted shyness and social disinterest. Maternal ratings of child temperament, parenting style, and social goals, teacher ratings of child social adjustment, observations of child free-play behaviors, and child interview assessments of perceived competence and preference for playing with peers were also collected. Distinct patterns of associations were found between conflicted shyness and social disinterest and outcome variables. Implications for the motivational underpinnings and adjustment outcomes of shyness and social disinterest are explored.     

How do use and comprehension of mental-state language relate to theory of mind in middle childhood?

This study investigates the relationship between mental-state language and theory of mind in primary school children. The participants were 110 primary school students (mean age = 9 years and 7 months; SD = 12.7 months). They were evenly divided by gender and belonged to two age groups (8- and 10-year-olds). Linguistic, metacognitive and cognitive measures were used to assess the following competencies: verbal ability, use of mental-state terms, understanding of metacognitive language, understanding of second-order false beliefs, and emotion comprehension. Correlations between children’ use of mental-state language and their performance on theory-of-mind tasks were moderate, whereas correlations between children's comprehension of such language and ToM abilities were high. In addition, regression analyses showed that comprehension of metacognitive language was the variable which best explained children's performance on both false belief tasks and an emotion comprehension test when verbal ability and age were controlled for.     

A challenge to vocational psychology: How important are aspirations in determining male career development?

Nationally representative longitudinal data on 1394 employed white men aged 15 to 24 in 1966 were used to assess whether job opportunities or vocational aspirations are the more important determinants of later job held. Support was found for two hypotheses: (a) men more often achieve congruence between their aspiration and their field of employment by changing aspirations to match the job rather than vice versa; and (b) aspirations for field of work generally are not as useful as actual job field for predicting the field of jobs held 1 to 5 years later. Contrary to expectation, middle-class young men were no more able to attain their aspirations either for field of employment or for status level of occupation than were lower-class male youths. These results suggest that although aspirations have some predictive power, the opportunity structure—which both conditions aspirations to narrow ranges early in life and affects the direction of early career development—is too often neglected by vocational psychology. One suggestion for counseling practice is that interest and maturity assessments be used as sources of information to both client and counselor about past influences. Attempts to actually counteract those influences should be clearly specified as such and separated from the assessment process.     

A decade of infant neuroimaging research: What have we learned and where are we going?

The past decade has seen the emergence of neuroimaging studies of infant populations. Incorporating imaging has resulted in invaluable insights about neurodevelopment at the start of life. However, little has been enquired of the experimental specifications and study characteristics of typical findings. This review systematically screened empirical studies that used electroencephalography (EEG), magnetoencephalography (MEG), functional near-infrared spectroscopy (fNIRS), and functional magnetic resonance imaging (fMRI) on infants (max. age of 24 months). From more than 21,000 publications, a total of 710 records were included for analyses. With the exception of EEG studies, infant studies with MEG, fNIRS, and fMRI were most often conducted around birth and at 12 months. The vast majority of infant studies came from North America, with very few studies conducted in Africa, certain parts of South America, and Southeast Asia. Finally, longitudinal neuroimaging studies were inclined to adopt EEG, followed by fMRI, fNIRS, and MEG. These results show that there is compelling need for studies with larger sample sizes, studies investigating a broader range of infant developmental periods, and studies from under- and less-developed regions in the world. Addressing these shortcomings in the future will provide a more representative and accurate understanding of neurodevelopment in infancy.     

The evolution of foresight: What is mental time travel, and is it unique to humans?

In a dynamic world, mechanisms allowing prediction of future situations can provide a selective advantage. We suggest that memory systems differ in the degree of flexibility they offer for anticipatory behavior and put forward a corresponding taxonomy of prospection. The adaptive advantage of any memory system can only lie in what it contributes for future survival. The most flexible is episodic memory, which we suggest is part of a more general faculty of mental time travel that allows us not only to go back in time, but also to foresee, plan, and shape virtually any specific future event. We review comparative studies and find that, in spite of increased research in the area, there is as yet no convincing evidence for mental time travel in nonhuman animals. We submit that mental time travel is not an encapsulated cognitive system, but instead comprises several subsidiary mechanisms. A theater metaphor serves as an analogy for the kind of mechanisms required for effective mental time travel. We propose that future research should consider these mechanisms in addition to direct evidence of future-directed action. We maintain that the emergence of mental time travel in evolution was a crucial step towards our current success.     

Relation between childhood peer victimization and adult perfectionism: are victims of indirect aggression more perfectionistic?

Using two independent samples and two different measures of perfectionism, this study investigated the hypothesized relation between retrospective accounts of perceived peer-inflicted emotional abuse during childhood and perfectionism in adulthood. Emotional victimization ('indirect' aggression) is characterized by behavior in which mental harm is inflicted on victims through exclusionary acts, gossiping, and rumor spreading. Study one: Self-reported questionnaires of indirect victimization [DIAS; Bjorkqvist, Lagerspetz, and Osterman, 1992] and perfectionism [multidimensional perfectionism scale; Hewitt and Flett, 1991] were administered to 162 (mean age=20.14 years) female undergraduate psychology students. Results support the predicted positive relationship between recalled indirect peer victimization and current socially prescribed/self-oriented perfectionism. Study two: self-reports of indirect peer victimization and perfectionism (eating disorder inventory-perfectionism) were collected from 196 (mean age=19.5 years) female undergraduate students. Again, recalled indirect peer victimization was a statistically significant predictor of current socially prescribed/self-oriented perfectionism whereas recalled direct (physical, verbal) peer victimization held no relation. Discussion addresses the implications of these results, which hold importance for both the bullying and perfectionism literatures.     

Using mismatch negativity to study central auditory processing in developmental language and literacy impairments: where are we, and where should we be going?

A popular theoretical account of developmental language and literacy disorders implicates poor auditory temporal processing in their etiology, but evidence from studies using behavioral measures has yielded inconsistent results. The mismatch negativity (MMN) component of the auditory event-related potential has been recommended as an alternative, relatively objective, measure of the brain's ability to discriminate sounds that is suitable for children with limited attention or motivation. A literature search revealed 26 studies of the MMN in individuals with dyslexia or specific language impairment and 4 studies of infants or children at familial risk of these disorders. Findings were highly inconsistent. Overall, attenuation of the MMN and atypical lateralization in the clinical group were most likely to be found in studies using rapidly presented stimuli, including nonverbal sounds. The MMN literature offers tentative support for the hypothesis that auditory temporal processing is impaired in language and literacy disorders, but the field is plagued by methodological inconsistencies, low reliability of measures, and low statistical power. The article concludes with recommendations for improving this state of affairs.     

CNS prophylaxis of childhood leukemia: What are the long-term neurological,neuropsychological, and behavioral effects?

Current medical treatments for childhood acute lymphoblastic leukemia (ALL) have improved the outlook to where more than 50% can be expected to survive five years or more. The use of CNS prophylaxis has contributed in a significant way to these improved survival statistics by reducing the likelihood of CNS relapses. The literature relating to the potential adverse psychological consequences of CNS prophylaxis, which include cranial radiation therapy (CRT), is reviewed and analyzed. The majority of published papers of children in first remission report that CNS prophylaxis, which include both CRT and intrathecal methotrexate, results in a variety of learning problems in many children who were younger than age 5 when treated. The available literature on the social, emotional, and educational sequelae of childhood ALL is also reviewed.Contributing Childrens Cancer Study Group investigators, institutions, and grant numbers are given in the Appendix. Address reprint requests to the Childrens Cancer Study Group, 440 East Huntington Drive, Suite 300, P.O. Box 60012, Arcadia, California 91066-6012.