Generalized models for estimating cerebral lateralisation of young children using functional transcranial Doppler ultrasound.

Thompson et al., 2023 (Generalized models for quantifying laterality using functional transcranial Doppler ultrasound. Human Brain Mapping, 44(1), 35-48) introduced generalised model-based analysis methods for determining cerebral lateralisation from functional transcranial Doppler ultrasound (fTCD) data which substantially decreased the uncertainty of individual lateralisation estimates across several large adult samples. We aimed to assess the suitability of these methods for increasing precision in lateralisation estimates for child fTCD data. We applied these methods to adult fTCD data to establish the validity of two child-friendly language and visuospatial tasks. We also applied the methods to fTCD data from 4- to 7-year-old children. For both samples, the laterality estimates from the complex generalised additive model (GAM) approach correlated strongly with the traditional methods while also decreasing individual standard errors compared to the popular period-of-interest averaging method. We recommend future research using fTCD with young children consider using GAMs to reduce the noise in their LI estimates.

Patterns of language and visuospatial functional lateralization and cognitive ability: a systematic review.

For most individuals, language is predominately localized to the left hemisphere of the brain and visuospatial processing to the right. This is the typical pattern of functional lateralization. Evolutionary theories of lateralization suggest that the typical pattern is most common as it delivers a cognitive advantage. In contrast, deviations from the typical pattern may lead to poorer cognitive abilities. The aim of this systematic review was to assess the evidence for an association between patterns of language and visuospatial lateralization and measures of cognitive ability. We screened 9,122 studies, retrieved from PsycINFO, EMBASE, MEDLINE, PubMed, and Web of Science. The 17 studies that met our selection criteria revealed little evidence for an advantage of typical compared to atypical patterns of lateralization, although atypical lateralization patterns were related to worse language comprehension, spatial ability, and reading, but further research is needed to confirm this. We conclude with recommendations that future researchers recruit larger samples of atypical participants, and consider strength of lateraliation and bilaterality when analysing functional lateralization patterns.

The influence of three-dimensional cues on body size judgements.

Research has shown that body size judgements are frequently biased, or inaccurate. Critically, judgement biases are further exaggerated for individuals with eating disorders, a finding that has been attributed to difficulties integrating body features into a perceptual whole. However, current understanding of which body features are integrated when judging body size is lacking. In this study, we examine whether individuals integrate three-dimensional (3D) cues to body volume when making body size judgements. Computer-generated body stimuli were presented in a 3D Virtual Reality environment. Participants (N = 412) were randomly assigned to one of the two conditions: in one condition, the to-be-judged body was displayed binocularly (containing 3D cues to body volume); in the other, bodies were presented monocularly (two-dimensional [2D] cues only). Across 150 trials, participants were required to make a body size judgement of a target female body from a third-person point of view using an unmarked visual analogue scale (VAS). It was found that 3D cues significantly influenced body size judgements. Namely, thin 3D bodies were judged smaller, and overweight 3D bodies were judged larger, than their 2D counterpart. Furthermore, to reconcile these effects, we present evidence that the two perceptual biases, regression to the mean and serial dependence, were reduced by the additional 3D feature information. Our findings increase our understanding of how body size is perceptually encoded and creates testable predictions for clinical populations exhibiting integration difficulties.

Magic Hats and Teddy Bear picnics: Language and visuospatial lateralisation tasks for children.

The behavioural outcomes associated with atypical cerebral lateralization during the early stages of cognitive development is an interesting research venture. However, there are few tasks for assessing lateralization in young children. The current study describes the Magic Hat task and the Teddy Bear Picnic task, which were designed to measure the lateralization of language and visuospatial attention, respectively, in children as young as three years old. Forty-five adults were recruited to complete the child-friendly tasks as well as the Word Generation and Landmark tasks whilst functional Transcranial Doppler ultrasound (fTCD) measured cerebral blood flow velocity. As expected, at the group level, the Magic Hat task produced left hemisphere lateralization, and the Teddy Bear Picnic task produced right hemisphere lateralization. Both tasks demonstrated high internal reliability (α > .80). The laterality indices produced by the Magic Hat task correlated with the Word Generation task, ρ = .52, p = .001. Likewise, the laterality indices produced by the Teddy Bear Picnic task correlated with the Landmark task, ρ = .45, p = .028. Thus, the Magic Hat and Teddy Bear Picnic tasks are reliable and valid measures of language and visuospatial lateralization, suitable for toddlers and young children using fTCD.

Sizing up the crowd: Assessing spatial integration difficulties in body size judgements across eating disorder symptomatology.

Introduction: Body size judgements are frequently biased, or inaccurate, and these errors are further exaggerated for individuals with eating disorders. Within the eating disorder literature, it has been suggested that exaggerated errors in body size judgements are due to difficulties with integration. Across two experiments, we developed a novel integration task, named the Ebbinghaus Illusion for Bodies in Virtual Reality (VR), to assess whether nearby bodies influence the perceived size of a single body. VR was used to simulate the appearance of a small crowd around a central target body. Method and Results: In Experiment 1 (N = 412), participants were required to judge the size of a central female target within a crowd. Experiment 1 revealed an Ebbinghaus Illusion, in which a central female appeared larger when surrounded by small distractors, but comparatively smaller when surrounded by large distractors. In other words, the findings of Experiment 1 demonstrate that surrounding crowd information is integrated when judging an individual's body size; a novel measure of spatial integration (i.e., an Ebbinghaus Illusion for Bodies in VR). In Experiment 2 (N = 96), female participants were selected based on high (n = 43) and low (n = 53) eating disorder symptomatology. We examined whether the magnitude of this illusion would differ amongst those with elevated versus low eating disorder symptomatology, in accordance with weak central coherence theory, with the high symptomatology group displaying less spatial integration relative to the low group. The results of Experiment 2 similarly found an Ebbinghaus Illusion for Bodies in VR. However, illusion magnitude did not vary across high and low symptomatology groups. Discussion: Overall, these findings demonstrate that surrounding crowd information is integrated when judging individual body size; however, those with elevated eating disorder symptomatology did not show any integration deficit on this broader measure of spatial integration.

Fearing Failure: Grandiose Narcissism, Vulnerable Narcissism, and Emotional Reactivity in Children.

The distinction between grandiose and vulnerable narcissism is new to the child literature, but initial findings suggest that it may have important implications for understanding adjustment. This study examined how expressions of narcissism in children influence their reactions to a mild egothreats experience. Children (N = 124; aged 8-12 years) completed self-ratings before and after doing a brief but challenging task. Negative emotions, self-conscious emotions, and performance estimates were measured. Regression analyses showed that, even after controlling the effects of self-esteem and temperament, vulnerable narcissism was related to increased hostility, anger, and shame, whereas grandiose narcissism was related to inflated performance estimates following the task. These results demonstrate the unique roles of grandiose and vulnerable narcissism in children.

Developmental vulnerabilities in children of chronically ill parents: a population-based linked data study.

BACKGROUND: Currently, there is mixed evidence regarding the effects on children when a parent is chronically ill. Research has also primarily been conducted with adolescent samples. This study investigated developmental vulnerabilities in young children of parents with chronic illness. METHODS: This study used linked administrative data. The study population included children born in Western Australia during 2003-2004 (n=19 071; mean age 5.5 years). The outcome measure was a score in the bottom 25% on any of the five developmental domains (physical, social, emotional, communicative and cognitive) of the Australian Early Development Census (2009 collection). Parental chronic illnesses were identified from hospital and cancer registry records, during the period from 1 year prior to the child's birth and until the end of 2009. RESULTS: Higher odds of developmental vulnerabilities in physical, social, emotional and communication domains were observed for daughters of chronically ill mothers. Sons of chronically ill mothers had increased odds of language and cognitive difficulties. Risk level increased with each additional year of exposure to maternal chronic illness. Results also indicated increased odds of developmental vulnerabilities for children of mothers experiencing multiple compared with single chronic conditions; however, results were not statistically significant (all p>0.05). No association between fathers' chronic illness and children's developmental outcomes was found. CONCLUSIONS: Maternal chronic illness is associated with an increased risk of poor developmental outcomes for children, particularly daughters. Healthcare services have an important role to play in linking families into appropriate family-centred services to best support the needs of chronically ill mothers.

Repeatable Battery for the Assessment of Neuropsychological Status (RBANS): Normative Data for Older Adults.

OBJECTIVE: Provide updated older adult (ages 60+) normative data for the Repeatable Battery for the Assessment of Neuropsychological Status (RBANS), Form A, using regression techniques, and corrected for education, age, and gender. METHOD: Participants (aged 60-93 years; N = 415) were recruited through the Healthy Ageing Research Program (HARP), University of Western Australia, and completed Form A of the RBANS as part of a wider neuropsychological test battery. Regression-based techniques were used to generate normative data rather than means-based methods. This methodology allows for the control of demographic variables using continuous data. To develop norms, the data were assessed for: (1) normality; (2) associations between each subtest score and age, education, and gender; (3) the effect of age, education, and gender on subtest scores; and (4) residual scores which were converted to percentile distributions. RESULTS: Differences were noted between the three samples, some of which were small and may not represent a clinically meaningful difference. Younger age, more years of education, and female gender were associated with better scores on most subtests. Frequency distributions, means, and standard deviations were produced using unstandardized residual scores to remove the effects of age, education, and gender. CONCLUSIONS: These normative data expand upon past work by using regression-based techniques to generate norms, presenting percentiles, as well as means and standard deviations, correcting for the effect of gender, and providing a free-to-use Excel macro to calculate percentiles.

Measuring Grandiose and Vulnerable Narcissism in Children and Adolescents: The Narcissism Scale for Children.

Clinical and empirical research have consistently distinguished two dimensions of narcissism: grandiose narcissism and vulnerable narcissism. However, to date there is no psychometrically validated measure of grandiose and vulnerable narcissism for children. A measure that assesses both expressions of narcissism in children and adolescents is necessary to understand the causes and consequences of narcissistic self-views prior to adulthood. In this article, four studies are presented documenting the construction and psychometric properties of a 15-item Narcissism Scale for Children, adapted from the (adult) Narcissism Scale. Partial confirmatory factor analysis supported two dimensions of narcissism in children (Study 1) and adolescents (Study 4), with evidence for good validity and reliability (Studies 1-4). As in adults, trait narcissism in children and adolescents consists of both grandiose and vulnerable dimensions. Enabling the measurement of multidimensional narcissism prior to adulthood has important implications for narcissism theory and future research.

The Children's Social Vulnerability Questionnaire (CSVQ): Validation, relationship with psychosocial functioning, and age-related differences.

Background/Objective: Social vulnerability refers to difficulties detecting potentially harmful interpersonal situations. Although it is an important predictor of psychosocial and interpersonal difficulties in clinical samples, research investigating this construct is scarce. We aimed to (a) develop a brief measure for assessing social vulnerability in typically developing children, the Children's Social Vulnerability Questionnaire (CSVQ) (b) examine the relationship between social vulnerability and psychosocial functioning, (c) explore age-related differences, and (d) explore levels of social vulnerability amongst children with clinical needs. Method: Data were gathered on two samples. Participants were parents (n = 790) of elementary school-aged children (3-12 years), and parents and teachers of a second sample (n = 96). Results: Results provide strong reliability and validity evidence. Social vulnerability showed moderate relationships with emotional and behavioural problems, and only a weak relationship with social skills. Parents perceived greater social vulnerability in younger than older children, and amongst children with clinical needs. Parents' and teachers' scores were correlated. Conclusions: Social vulnerability is not simply a lack of social skill; rather, it is a valuable construct for understanding psychosocial risk, especially for young and clinical samples of children.

Antecedentes/Objetivo: La vulnerabilidad social alude a dificultades para detectar situaciones interpersonales potencialmente dañinas. Aunque es un predictor importante de las dificultades, la investigación es escasa. Por tanto, se plantea (a) describir las propiedades psicométricas del Children's Social Vulnerability Questionnaire (CSVQ), (b) examinar la relación entre vulnerabilidad social y funcionamiento psicosocial, (c) explorar las diferencias relacionadas con la edad, y (d) explorar los niveles de vulnerabilidad social en niños con necesidades clínicas. Método: Los datos se recogieron en dos muestras. Los participantes fueron padres (n = 790) de niños de Educación Primaria, y padres y profesores de una segunda muestra (n = 96). Resultados: Se proporciona evidencia sólida acerca de la fiabilidad y validez. La vulnerabilidad social mostró relaciones moderadas con problemas emocionales y de comportamiento, y sólo una relación débil con las habilidades sociales. Los padres percibieron una mayor vulnerabilidad social en los niños más jóvenes que en los mayores, y entre niños con necesidades clínicas. Los informes de padres y profesores estaban correlacionados. Conclusiones: La vulnerabilidad social no es equivalente a las habilidades sociales, pero es un valioso constructo para la comprensión del riesgo psicosocial, especialmente en muestras clínicas y en niños de menor edad.

The Children's Social Vulnerability Questionnaire (CSVQ): Validation, relationship with psychosocial functioning, and age-related differences / Children's Social Vulnerability Questionnaire (CSVQ): validación, relación con el funcionamiento psicosocial y diferencias relacionadas con la edad

Background/Objective: Social vulnerability refers to difficulties detecting potentially harmful interpersonal situations. Although it is an important predictor of psychosocial and interpersonal difficulties in clinical samples, research investigating this construct is scarce. We aimed to (a) develop a brief measure for assessing social vulnerability in typically developing children, the Children's Social Vulnerability Questionnaire (CSVQ) (b) examine the relationship between social vulnerability and psychosocial functioning, (c) explore age-related differences, and (d) explore levels of social vulnerability amongst children with clinical needs. Method: Data were gathered on two samples. Participants were parents (n = 790) of elementary school-aged children (3-12 years), and parents and teachers of a second sample (n = 96). Results: Results provide strong reliability and validity evidence. Social vulnerability showed moderate relationships with emotional and behavioural problems, and only a weak relationship with social skills. Parents perceived greater social vulnerability in younger than older children, and amongst children with clinical needs. Parents’ and teachers’ scores were correlated. Conclusions: Social vulnerability is not simply a lack of social skill; rather, it is a valuable construct for understanding psychosocial risk, especially for young and clinical samples of children

Antecedentes/Objetivo: La vulnerabilidad social alude a dificultades para detectar situaciones interpersonales potencialmente dañinas. Aunque es un predictor importante de las dificultades, la investigación es escasa. Por tanto, se plantea (a) describir las propiedades psicométricas del Children's Social Vulnerability Questionnaire (CSVQ), (b) examinar la relación entre vulnerabilidad social y funcionamiento psicosocial, (c) explorar las diferencias relacionadas con la edad, y (d) explorar los niveles de vulnerabilidad social en niños con necesidades clínicas. Método: Los datos se recogieron en dos muestras. Los participantes fueron padres (n = 790) de niños de Educación Primaria, y padres y profesores de una segunda muestra (n = 96). Resultados: Se proporciona evidencia sólida acerca de la fiabilidad y validez. La vulnerabilidad social mostró relaciones moderadas con problemas emocionales y de comportamiento, y sólo una relación débil con las habilidades sociales. Los padres percibieron una mayor vulnerabilidad social en los niños más jóvenes que en los mayores, y entre niños con necesidades clínicas. Los informes de padres y profesores estaban correlacionados. Conclusiones: La vulnerabilidad social no es equivalente a las habilidades sociales, pero es un valioso constructo para la comprensión del riesgo psicosocial, especialmente en muestras clínicas y en niños de menor edad

Using linked data to investigate developmental vulnerabilities in children of convicted parents.

There is evidence that children of incarcerated parents are at risk of poor developmental and educational outcomes. However, much of this evidence is limited by biased samples, as studies must rely on opt-in recruitment. Administrative data present an opportunity to overcome this challenge, as they capture information on all incarcerated individuals. This study used administrative data on convictions of the parents of 19,071 children aged 5-6 years in Western Australia. Records of parental convictions (starting from 1 year prior to the child's birth) were linked to children's scores on the Australian Early Development Census, which is a teacher-reported measure of children's physical, social, emotional, communicative, and cognitive development. Logistic regression models estimated the odds of children of convicted parents being developmentally vulnerable. Models were adjusted for child, parent, and neighborhood sociodemographic factors. Compared to children in the comparison group, children whose parent had either served a community order or been incarcerated were at risk of poor development across all developmental domains, even after adjusting for sociodemographic factors. Furthermore, children of incarcerated parents had higher odds of developmental vulnerability on multiple domains compared to children of parents who had served community orders only. The results suggest that, although children of convicted parents experience a higher incidence of sociodemographic risk, their parents' criminal activity constitutes an independent risk factor for their development. Intervention to support the early development of children of convicted parents is therefore essential, and should consider the family context. (PsycINFO Database Record

Working memory consolidation: insights from studies on attention and working memory.

Working memory, the system that maintains a limited set of representations for immediate use in cognition, is a central part of human cognition. Three processes have recently been proposed to govern information storage in working memory: consolidation, refreshing, and removal. Here, we discuss in detail the theoretical construct of working memory consolidation, a process critical to the creation of a stable working memory representation. We present a brief overview of the research that indicated the need for a construct such as working memory consolidation and the subsequent research that has helped to define the parameters of the construct. We then move on to explicitly state the points of agreement as to what processes are involved in working memory consolidation.

School readiness of maltreated children: Associations of timing, type, and chronicity of maltreatment.

Children who have been maltreated during early childhood may experience a difficult transition into fulltime schooling, due to maladaptive development of the skills and abilities that are important for positive school adaptation. An understanding of how different dimensions of maltreatment relate to children's school readiness is important for informing appropriate supports for maltreated children. In this study, the Australian Early Development Census scores of 19,203 children were linked to information on child maltreatment allegations (substantiated and unsubstantiated), including the type of alleged maltreatment, the timing of the allegation (infancy-toddlerhood or preschool), and the total number of allegations (chronicity). Children with a maltreatment allegation had increased odds of poor school readiness in cognitive and non-cognitive domains. Substantiated maltreatment was associated with poor social and emotional development in children, regardless of maltreatment type, timing, or chronicity. For children with unsubstantiated maltreatment allegations, developmental outcomes according to the type of alleged maltreatment were more heterogeneous; however, these children were also at risk of poor school readiness irrespective of the timing and/or chronicity of the alleged maltreatment. The findings suggest that all children with maltreatment allegations are at risk for poor school readiness; hence, these children may need additional support to increase the chance of a successful school transition. Interventions should commence prior to the start of school to mitigate early developmental difficulties that children with a history of maltreatment allegations may be experiencing, with the aim of reducing the incidence of continuing difficulties in the first year of school and beyond.

The relationship between sleep and working memory in children with neurological conditions.

The objective of this study is to investigate whether sleep problems might account for the increased working memory deficits observed in school-aged children with neurological conditions. A novel, transdiagnostic approach to the investigation was chosen, and sleep is treated as a process that can potentially account for working memory difficulties across a range of neurological conditions. Prevalence estimates of sleep problems are also examined. Archival data of 237 children aged 6 to 11 years were collected from a Western Australian statewide neuropsychological service for the period 26 July 2011 to 14 January 2014. Measures of parent-reported sleep quality, snoring, and daytime sleepiness were obtained, in addition to objective measures of verbal and spatial working memory, storage capacity, and processing speed. The results of the data analysis reveal that over one third of participants reported having clinically-significant levels of sleep problems and that poor sleep quality is significantly associated with verbal working memory difficulties. This association remains after partialling out the variance contributed to performance by storage capacity and processing speed, suggesting that sleep is impacting upon an executive component of working memory. No other significant associations are observed. The results suggest that poor sleep quality is associated with an executive component of verbal (rather than spatial) working memory in children with neurological conditions. This has implications for the biological mechanisms thought to underlie the relationship between sleep and cognition in children. The results also demonstrate the clinical utility of a transdiagnostic approach when investigating sleep and cognition in children with neurological conditions.

The relationship between sleep problems and working memory in children born very preterm.

In two studies, the relationship between sleep and working memory performance was investigated in children born very preterm (i.e., gestation less than 32 weeks) and the possible mechanisms underlying this relationship. In Study 1, parent-reported measures of snoring, night-time sleep quality, and daytime sleepiness were collected on 89 children born very preterm aged 6 to 7 years. The children completed a verbal working memory task, as well as measures of processing speed and verbal storage capacity. Night-time sleep quality was found to be associated with verbal working memory performance over and above the variance associated with individual differences in processing speed and storage capacity, suggesting that poor sleep may have an impact on the executive component of working memory. Snoring and daytime sleepiness were not found to be associated with working memory performance. Study 2 introduced a direct measure of executive functioning and examined whether sleep problems would differentially impact the executive functioning of children born very preterm relative to children born to term. Parent-reported sleep problems were collected on 43 children born very preterm and 48 children born to term (aged 6 to 9 years). Problematic sleep was found to adversely impact executive functioning in the very preterm group, while no effect of sleep was found in the control group. These findings implicate executive dysfunction as a possible mechanism by which problematic sleep adversely impacts upon cognition in children born very preterm, and suggest that sleep problems can increase the cognitive vulnerability already experienced by many of these children.

Confirmatory factor analysis of the Sleep Disturbance Scale for Children (SDSC) in a clinical sample of children and adolescents.

The Sleep Disturbance Scale for Children was developed as a parent-report measure to screen for sleep disturbances within the preceding 6 months. Notably, the scale was developed using a sample of typically developing children and children with sleep disorders. The aim of this study was to factor analyse the Sleep Disturbance Scale for Children using a clinical sample of children with a range of neuropsychological conditions and co-morbidities, and determine whether the original six-factor structure was retained. Four-hundred and sixteen children aged 5-17 years were assessed at the Neurosciences Unit (Perth, Western Australia) as part of routine, clinical neuropsychological assessment. Parents and guardians also completed the Sleep Disturbance Scale for Children to rate their child's sleep. Confirmatory factor analysis of the original Sleep Disturbance Scale for Children model (Bruni et al. J. Sleep Res., 1996, 5: 251-261) revealed a less than ideal fit. Three adjustments were made to the model based on factor loadings and modification indices. The sleep hyperhidrosis factor (including items 9 and 16) along with item 10 was removed, leaving a five-factor Sleep Disturbance Scale for Children model. The five-factor model (Sleep Disturbance Scale for Children-R) was factor analysed, and examination of model fit statistics indicated that this new model produced good fit. Additional analyses revealed that older children had greater difficulty falling and staying asleep, and with daytime sleepiness. However, no significant differences were observed across gender, diagnosis or socioeconomic status. The results of this study suggest that the Sleep Disturbance Scale for Children-R may be a more appropriate measure when assessing clinical samples. However, further research is required to validate the Sleep Disturbance Scale for Children-R against objective measures of sleep and to determine appropriate t-score cut-offs.

Self-regulatory speech during planning and problem-solving in children with SLI and their typically developing peers.

BACKGROUND: Past research with children with specific language impairment (SLI) has shown them to have poorer planning and problem-solving ability, and delayed self-regulatory speech (SRS) relative to their typically developing (TD) peers. However, the studies are few in number and are restricted in terms of the number and age range of participants, which limits our understanding of the nature and extent of any delays. Moreover, no study has examined the performance of a significant subset of children with SLI, those who have hyperactive and inattentive behaviours. AIMS: This cross-sectional study aimed to compare the performance of young children with SLI (aged 4-7 years) with that of their TD peers on a planning and problem-solving task and to examine the use of SRS while performing the task. Within each language group, the performance of children with and without hyperactive and inattentive behaviours was further examined. METHODS & PROCEDURES: Children with SLI (n = 91) and TD children (n = 81), with and without hyperactive and inattentive behaviours across the three earliest school years (Kindergarten, Preprimary and Year 1) were video-taped while they completed the Tower of London (TOL), a planning and problem-solving task. Their recorded speech was coded and analysed to look at differences in SRS and its relation to TOL performance across the groups. MAIN CONTRIBUTION: Children with SLI scored lower on the TOL than TD children. Additionally, children with hyperactive and inattentive behaviours performed worse than those without hyperactive and inattentive behaviours, but only in the SLI group. This suggests that children with SLI with hyperactive and inattentive behaviours experience a double deficit. Children with SLI produced less inaudible muttering than TD children, and showed no reduction in social speech across the first three years of school. Finally, for children with SLI, a higher percentage performed better on the TOL when they used SRS than when they did not. CONCLUSIONS & IMPLICATIONS: The results point towards a significant delay in the development and internalization of SRS in the SLI group, which should be taken into account when considering the planning and problem-solving of young children with SLI.

Poorer divided attention in children born very preterm can be explained by difficulty with each component task, not the executive requirement to dual-task.

Children born very preterm (VP, ≤ 32 weeks) exhibit poor performance on tasks of executive functioning. However, it is largely unknown whether this reflects the cumulative impact of non-executive deficits or a separable impairment in executive-level abilities. A dual-task paradigm was used in the current study to differentiate the executive processes involved in performing two simple attention tasks simultaneously. The executive-level contribution to performance was indexed by the within-subject cost incurred to single-task performance under dual-task conditions, termed dual-task cost. The participants included 77 VP children (mean age: 7.17 years) and 74 peer controls (mean age: 7.16 years) who completed Sky Search (selective attention), Score (sustained attention) and Sky Search DT (divided attention) from the Test of Everyday Attention for Children. The divided-attention task requires the simultaneous performance of the selective- and sustained-attention tasks. The VP group exhibited poorer performance on the selective- and divided-attention tasks, and showed a strong trend toward poorer performance on the sustained-attention task. However, there were no significant group differences in dual-task cost. These results suggest a cumulative impact of vulnerable lower-level cognitive processes on dual-tasking or divided attention in VP children, and fail to support the hypothesis that VP children show a separable impairment in executive-level abilities.

Poor executive functioning in children born very preterm: Using dual-task methodology to untangle alternative theoretical interpretations.

Two alternative theoretical explanations have been proposed for the difficulties with executive functioning observed in children born very preterm (VP; ⩽32 weeks): a general vulnerability (i.e., in attentional and processing capacities), which has a cascading impact on increasingly complex cognitive functions, and a selective vulnerability in executive-level cognitive processes. It is difficult to tease apart this important theoretical distinction because executive functioning tasks are, by default, complex tasks. In the current study, an experimental dual-task design was employed to control for differences in task difficulty in order to isolate executive control. Participants included 50 VP children (mean age=7.29 years) and 39 term peer controls (mean age=7.28 years). The VP group exhibited a greater dual-task cost relative to controls despite experimental control for individual differences in baseline ability on the component single tasks. This group difference also remained under a condition of reduced task difficulty. These results suggest a selective vulnerability in executive-level processes that can be separated from any general vulnerability.