Executive functioning in Spanish- and English-speaking Head Start preschoolers

A Comparison of Three Executive Function Batteries in a Preschool-Aged Sample

There is great interest in the development of executive function (EF) in the preschool period. Accordingly, multiple performance-based measures of EF have been developed for this age group, yet little is known about how they compare to one another. This study used a large and diverse sample of 3-to-5-year-old children (N = 846), who completed subtests of the National Institutes of Health's Toolbox Cognition Battery (NTCB), the Wechsler Preschool and Primary Scale of Intelligence (WPPSI-IV), and the EF Touch battery. Scores across the three batteries were compared and associations with age, income, and race/ethnicity were examined. Results revealed that (1) the three tasks were moderately correlated (r = 0.44-0.51, all p < 0.001), but children had higher mean accuracy scores on EF Touch than on the NTCB or the WPPSI-IV. (2) Mean accuracy scores on all batteries were linearly associated with child age (all F > 32.68, all p < 0.0001). (3) Comparisons by income and race/ethnicity showed lower accuracy for low-income children on the WPPSI-IV and lower accuracy for White children on the NTCB. Across all batteries, there was consistently lower accuracy for Hispanic children. In conclusion, the three batteries we examined performed similarly across several metrics. EF Touch may be more appropriate for younger children, while the NTCB performed well with older children.

Cognitive Distancing Language in Parent-Child Book Sharing Among Low-Income Mexican American and Chinese American Families: Cultural Group Comparisons and Links to Children's Executive Functions

Research Findings

In the context of parent-child book sharing, cultural influences on cognitive distancing language and its associations with child executive function (EF) have been understudied. This study examined cultural group similarities/differences in parent and child book-sharing distancing language among preschool-aged dual language learners from low-income Mexican American (MA) and Chinese American (CA) families. We further tested concurrent relations between parent/child distancing language and children's EF. The sample consisted of 88 children (45 MAs, 43 CAs, age = 38-68 months) enrolled in Head Start preschools and their parents. To assess distancing language, utterances were coded for cognitive demand and classified as referential (low demand), behavioral (moderate demand), or inferential (high demand). Cognitive tasks tapping inhibitory control and cognitive flexibility were used to assess child EF. Results showed parents and children from both cultural groups produced comparable numbers of story-related utterances. MA dyads used higher proportions of parent/child inferential statements and a lower proportion of parent referential questions. The proportions of parent behavioral questions and child behavioral statements were positively related to child cognitive flexibility.

Practice or Policy

Findings highlight heterogeneity in parent-child verbal interactions among low-income multilingual families and have implications for promoting preschoolers' cognitive/language development in diverse populations.

Is there a cognitive advantage in inhibition and switching for bilingual children? A systematic review

Several studies have pointed to beneficial effects of bilingualism on executive functioning. However, observations of these beneficial effects have at times proven difficult to reproduce. Moreover, findings of studies on cognitive effects of bilingualism have been contested altogether. These contradictory outcomes leave the research field of bilingualism at unease. In the present review article, we aim to give a systematic overview of previous research on bilingual advantages in inhibition and switching in children up to the age of 12. Particular attention is paid to the experimental tasks that have been applied and the persistence of possible effects throughout critical and post-critical periods for cognitive development in children. In doing so, the review gives an insight in both the validity and robustness of possible domain-general cognitive effects of bilingualism in children. Terminological issues are also discussed.

Characterization of English and Spanish language proficiency among middle school English learners with reading difficulties

Among bilinguals, language-related variables such as first and second language proficiency and balance may be related to important cognitive and academic outcomes, but approaches to characterizing these variables are inconsistent, particularly among at-risk samples of children. The current study employed comprehensive language assessment of English and Spanish language skills and contrasted various approaches to the characterization of language among at-risk ELs in middle school (N = 161). Specifically, we contrasted variable-centered and person-centered approaches, and convergence between objective and self-report measures. Findings support a two-factor structure of English and Spanish language skills in this population, three profiles of students (balanced, moderately unbalanced-higher Spanish, and very unbalanced-higher English), convergence between variable-centered and person-centered approaches, and mixed support for subjective indices of usage. Results provide a foundation from which to examine the roles of L1 and L2 proficiency as well as balance in important cognitive and academic outcomes in this at-risk and understudied population.

Evaluating the Impact of a Targeted Approach Designed to Build Executive Function Skills: A Randomized Trial of Brain Games

This paper reports results from an impact study of Brain Games (BGs), a classroom-based intervention designed to build preschool and school-aged children’s executive functions (EFs) and related self-regulation skills. The study employed a classroom-randomized, experimental design with 626 students in 36 pre-K through fourth grade classrooms in charter schools in a mid-sized urban district. In one set of models with child covariates, children in intervention classrooms showed marginal positive impacts on regulation-related behaviors, attention control and impulsivity, and negative effects on global EF and marginal increases in discipline problems. A second set of models with a smaller sample and both child and classroom covariates included indicate positive impacts of BGs on global EFs, prosocial behavior, and attention control and impulsivity. There were no significant impacts on the teacher–student relationship as reported by the teacher or on direct assessments of inhibitory control, short term and working memory, or another measure of global EF in either set of models. These promising findings offer a signal that implementation of targeted, easy to implement intervention approaches in classroom contexts can influence children’s regulation-related and prosocial outcomes, but this signal should be investigated further with larger and more tightly controlled designs.

Impacts on Head Start Dual Language Learning Children’s Early Science Outcomes

The present study examined the roles that language of assessment, language dominance, and teacher language use during instruction play in Dual Language Learner (DLL) science scores. A total of 255 Head Start DLL children were assessed on equated science assessments in English and Spanish. First overall differences between the two languages were examined, then associations between performance on science assessments were compared and related to children’s language dominance, teacher quantity of English and Spanish, and teachers’ academic science language. When examined as a homogeneous group, DLLs did not perform differently on English or Spanish science assessments. However, when examined heterogeneously, Spanish-dominant DLLs performed better on Spanish science assessments. The percentage of English and Spanish used by teachers did not affect children’s science scores. Teachers’ use of Spanish academic science language impacted children’s performance on science assessments, but English did not. The results have implications for the assessment of DLLs and teacher language use during instruction.

Home Language Environment and Executive Functions in Mexican American and Chinese American Preschoolers in Head Start

Research Findings

Using two groups of dual language learners (DLLs), the current study examined links between two developmental constructs closely linked to school readiness: the home language environment (HLE) and executive function (EF). In a sample of 90 children (age range = 38-70 months, 59% girls) from either Mexican American (MA, N = 46) or Chinese American (CA, N = 44) low-income families enrolled in Head Start preschool programs, parents reported on their HLE (home language balance, home English/heritage language activities) and children's EF (inhibitory control and attention shifting) was measured by cognitive tasks. Findings showed preschool-aged DLLs in low-income immigrant families received more heritage language exposure relative to English language exposure at home. Several demographic variables (parental education, per capita income, DLL group, child age of English acquisition, child generation, child English receptive vocabulary) were related to various aspects of HLE. Controlling for covariates, the amount of heritage language activities at home was uniquely and positively related to children's attention shifting.

Practice or Policy

The findings underscore the importance of incorporating language background considerations when designing intervention programs that target HLE and EF in low-income DLLs.

How Living in Vulnerable Conditions Undermines Cognitive Development: Evidence from the Pediatric Population of Guatemala

Low-socioeconomic backgrounds represent a risk factor for children’s cognitive development and well-being. Evidence from many studies highlights that cognitive processes may be adversely affected by vulnerable contexts. The aim of this study was to determine if living in vulnerable conditions affects childhood cognitive development. To achieve this, we assessed the performance of a sample of 347 Guatemalan children and adolescents aged from 6 to 17 years (M = 10.8, SD = 3) in a series of 10 neuropsychological tasks recently standardized for the pediatric population of this country. Two-fifths of the sample (41.5%) could be considered to have vulnerable backgrounds, coming from families with low-socioeconomic status or having had a high exposure to violence. As expected, results showed lower scores in language and attention for the vulnerable group. However, contrary to expectations, consistent systematic differences were not found in the executive function tasks. Vulnerable children obtained lower scores in cognitive flexibility compared to the non-vulnerable group, but higher scores in inhibition and problem-solving tasks. These results suggest the importance of developing pediatric standards of cognitive performance that take environmental vulnerable conditions into consideration. These findings, one of the first obtained in the Guatemalan population, also provide relevant information for specific educational interventions and public health policies which will enhance vulnerable children and adolescent cognitive development.

Is There an Association between Executive Function and Receptive Vocabulary in Bilingual Children? A Longitudinal Examination

Dual language management has been proposed as the reason for bilingual children’s sometimes enhanced executive functioning (EF). We sought to identify the directionality of the relation between language proficiency and EF, using measures of receptive vocabulary, inhibitory control, and cognitive flexibility. Data were collected twice, a year apart, on 35- to 66.8-month-old bilingual (n = 41, M = 49.19 months) and monolingual preschool children (n = 37, M = 47.82 months). The longitudinal results revealed that while the monolingual children’s vocabulary at Time 1 predicted EF at Time 2, EF at Time 1 did not predict vocabulary at Time 2. In contrast, for bilingual children the relation was not present at all. The results were similar after the one-time analyses. The absence of relations between EF and language in bilinguals, while present in monolinguals, challenges the current conceptualization of the EF advantage in bilinguals, and emphasizes the need for more research on the development of bilingual children.

Meta-Analysis Reveals a Bilingual Advantage That Is Dependent on Task and Age

Debate continues on whether a bilingual advantage exists with respect to executive functioning. This report synthesized the results of 170 studies to test whether the bilingual advantage is dependent on the task used to assess executive functioning and the age of the participants. The results of the meta-analyses indicated that the bilingual advantage was both task- and age-specific. Bilinguals were significantly faster than monolinguals (Hedges' g values ranged from 0.23 to 0.34), and significantly more accurate than monolinguals (Hedges' g values ranged between 0.18 and 0.49) on four out of seven tasks. Also, an effect of age was found whereby the bilingual advantage was larger for studies comprising samples aged 50-years and over (Hedges' g = 0.49), compared to those undertaken with participants aged between 18 and 29 years (Hedges' g = 0.12). The extent to which the bilingual advantage might be due to publication bias was assessed using multiple methods. These were Egger's Test of Asymmetry, Duval and Tweedie's Trim and Fill, Classic Fail-Safe N, and PET-PEESE. Publication bias was only found when using Egger's Test of Asymmetry and PET-PEESE method, but not when using the other methods. This review indicates that if bilingualism does enhance executive functioning, the effects are modulated by task and age. This may arise because using multiple languages has a highly specific effect on executive functioning which is only observable in older, relative to younger, adults. The finding that publication bias was not uniformly detected across the different methods raises questions about the impact that unpublished (or undetected) studies have on meta-analyses of this literature.

Towards understanding the bilingual profile in typical and atypical language development: A tutorial

Purpose: The purpose of this tutorial is to inform assessment, treatment and research approaches that are uniquely tailored to bilingual children with and without developmental language disorder (DLD), a communication disorder characterised by weaknesses in language production and comprehension.Method: A review is presented on what is known about joint language activation in adult and child bilinguals. This supports a discussion of the bilingual profile, which includes cross-language interactions and associations with broader cognitive functions. This is followed by consideration on how these bilingual phenomena may manifest in the context of relatively weak language skills, as is the case with DLD.Result: In addition to exploring the bilingual profile, guidelines are provided for incorporating cognates - a type of translation equivalent with distinct overlap in form and meaning that enhances cross-linguistic interactions - in language assessment, therapy and research.Conclusion: The field of speech-language pathology would benefit from more tools specifically designed for bilingual children. Already, there is interest in clinical applications of cognates, as they may support transfer and generalisation across languages. Future research is needed to better explore this potential in child bilinguals, particularly those with DLD. Such work would help establish a developmental bilingual language processing model with clinical relevance.

Relations of English and Heritage Language Proficiency to Response Inhibition and Attention Shifting in Dual Language Learners in Head Start

This study examined the concurrent relations of English (EL) and heritage language (HL) proficiency to executive functions (EF) among low-income dual language learners (DLLs) from immigrant families. In a sample of 90 children (age = 38 to 70 months) from Chinese-speaking Chinese American and Spanish-speaking Mexican American families recruited from Head Start preschools, children's EL and HL proficiency was assessed using receptive and expressive vocabulary tests, and EF was assessed using behavioral tasks measuring response inhibition and attention shifting. Multiple regressions were conducted to test the unique and interactive relations of EL and HL vocabulary to EF, controlling for family socioeconomic status and other demographic characteristics. Higher EL and higher HL vocabulary were uniquely associated with higher attention shifting. By contrast, neither EL nor HL vocabulary was uniquely associated with response inhibition. Interaction effects of EL × HL in relation to EF were also found. The results provided some evidence for the dual benefits of EL and HL proficiency on EF (especially attention shifting) among DLLs from low-income, immigrant families.