Investigating the Mediating Role of Executive Function in the Relationship Between ADHD and DCD Symptoms and Depression in Adults.

This study was designed to test the effects of Attention Deficit Hyperactivity Disorder (ADHD) and Developmental Co-ordination Disorder (DCD) on depression levels and investigate the mediating role of executive function (EF) in adults. Adults with ADHD, DCD, and ADHD + DCD (N = 139) completed self-report measures of ADHD, DCD, depression, and EF. There were distinct profiles of EF across diagnostic groups, and higher depression symptoms in adults with ADHD + DCD than DCD alone. All EF domains were predicted by ADHD symptoms, and several by DCD symptoms. ADHD and DCD symptoms, and most EF domains, predicted depression symptoms. Overall EF difficulties fully mediated the relationships between ADHD/DCD and depression symptoms. Several specific EF domains relating to behavioural regulation and metacognition also showed full/partial mediating effects. The mediating role of EF difficulties between these neurodevelopmental conditions and depression symptoms has implications for their understanding and treatment, suggesting that targeting EF may be important for preventing co-occurring depression.

Anxiety, concerns and COVID-19: Cross-country perspectives from families and individuals with neurodevelopmental conditions.

Background: The COVID-19 pandemic had a major impact on the mental health and well-being of children with neurodevelopmental conditions (NDCs) and of their families worldwide. However, there is insufficient evidence to understand how different factors (e.g., individual, family, country, children) have impacted on anxiety levels of families and their children with NDCs developed over time. Methods: We used data from a global survey assessing the experience of 8043 families and their children with NDCs (mean of age (m) = 13.18 years, 37% female) and their typically developing siblings (m = 12.9 years, 45% female) in combination with data from the European Centre for Disease Prevention and Control, the University of Oxford, and the Central Intelligence Agency (CIA) World Factbook, to create a multilevel data set. Using stepwise multilevel modelling, we generated child-, family- and country-related factors that may have contributed to the anxiety levels of children with NDCs, their siblings if they had any, and their parents. All data were reported by parents. Results: Our results suggest that parental anxiety was best explained by family-related factors such as concerns about COVID-19 and illness. Children's anxiety was best explained by child-related factors such as children's concerns about loss of routine, family conflict, and safety in general, as well as concerns about COVID-19. In addition, anxiety levels were linked to the presence of pre-existing anxiety conditions for both children with NDCs and their parents. Conclusions: The present study shows that across the globe there was a raise in anxiety levels for both parents and their children with NDCs because of COVID-19 and that country-level factors had little or no impact on explaining differences in this increase, once family and child factors were considered. Our findings also highlight that certain groups of children with NDCs were at higher risk for anxiety than others and had specific concerns. Together, these results show that anxiety of families and their children with NDCs during the COVID-19 pandemic were predicted by very specific concerns and worries which inform the development of future toolkits and policy. Future studies should investigate how country factors can play a protective role during future crises.

The Prevalence of Attention Deficit/Hyperactivity Disorder Symptoms in Children and Adolescents With Autism Spectrum Disorder Without Intellectual Disability: A Systematic Review.

OBJECTIVE: ADHD commonly co-occurs with ASD without ID in young people. It has been difficult to obtain accurate prevalence estimates of ADHD in this population, as a dual-diagnosis was not permitted until DSM-V. We systematically reviewed the literature on the prevalence of ADHD symptoms in young people with ASD without ID. METHOD: 9,050 articles were identified through six databases. Articles were reviewed against inclusion and exclusion criteria and 23 studies were included. RESULTS: ADHD symptom prevalence varied from 2.6% to 95.5%. We discuss these findings according to the ADHD assessment measure, informant, diagnostic criteria, risk of bias rating and recruitment pool. CONCLUSION: ADHD symptoms are common in young people with ASD without ID, but there is substantial variance in study reporting. Future studies should recruit participants from community sources, provide information on key sociodemographic sample characteristics and assess ADHD with standardized diagnostic criteria, using both parent/carer and teacher report.

Lived experiences of depression in autistic children and adolescents: A qualitative study on child and parent perspectives.

BACKGROUND: Depression is highly prevalent in autistic children and adolescents. Despite this, little is known about the nature of the autistic child's subjective experience of depression and the impact of depression on their lives. METHODS: We therefore conducted a qualitative study using thematic analysis with 7 autistic children and adolescents and their parents to identify common themes and individual differences. All children had previously experienced at least one depressive episode. RESULTS: Six main themes were identified: (1) Autism related experiences; (2) Difficulties with peer relationships; (3) Co-occurring relationships between anxiety and depression; (4) Impactful pessimism and anhedonia; (5) Impactful difficulties with focus and concentration and (6) Feelings of irritability, including aggressive behaviours. Parent's accounts of their children's experience of depression mirrored the child's perspective. Novel findings included reports of depression related restriction of diet variety and masking of mental health difficulties. Children and parents linked being autistic and developing depression, referring to the difficulties of being autistic in a complex, neurotypical world. CONCLUSIONS: These results highlight key challenges that autistic children and their families experience, calling for increased awareness of the impact of depression on autistic young people.

Cognition and maths in children with Attention-Deficit/Hyperactivity disorder with and without co-occurring movement difficulties.

BACKGROUND: Movement difficulties are common in ADHD, however, the implications of their co-occurrences on cognitive and maths performance is unknown. AIMS: This study set out to examine whether cognitive and maths performance of children with high ADHD symptoms differs depending on the co-occurrence of movement difficulties given evidence that weaker visuospatial processing, known to be important for maths performance, differentiates ADHD and DCD. We also aimed to examine whether relationships between cognition and maths in ADHD differs depending on co-occurring movement difficulties. METHODS: Participants were 43 drug naïve children between 6 and 12 years old (M = 101.53 months SD = 19.58). The ADHD-only group (n = 18) included children with high ADHD scores, and those in the ADHD+DCD group (n = 25) concurrently had high movement difficulty scores. All completed executive function and memory, including 2 visuo-spatial memory tasks from the CANTAB battery and Mathematics Problem Solving, Numeracy, and Maths Fluency tasks from the WIAT-III and specific factual, conceptual, and procedural maths component tasks. RESULTS: Children in the ADHD+DCD group scored significantly lower on visuospatial working memory (WM) capacity, than those in the ADHD-only group. Both groups were comparable on all other cognitive assessments of executive functions, memory, and processing speed. The groups did not differ in their maths attainment scores, nor on more specific maths skills. Comparison of the correlations between cognitive processes and maths revealed that the association between visuospatial WM updating and procedural skill efficiency was stronger for the ADHD-only group. Moreover, associations between visuospatial WM and maths problem solving attainment were stronger in the ADHD+DCD group. CONCLUSIONS: Despite similarities in maths performance, children with ADHD+DCD could be distinguished by lower visuospatial WM. Differential associations with some of the maths domain implicate recruitment of different cognitive processes for some aspects of maths. This distinction can be particularly useful for conceptualising cognitive characteristics of different clinical groups and understanding cognitive pathways of maths difficulties. Implications for interventions are discussed.

Understanding and Supporting Attention Deficit Hyperactivity Disorder (ADHD) in the Primary School Classroom: Perspectives of Children with ADHD and their Teachers.

Children with Attention Deficit Hyperactivity Disorder (ADHD) are more at risk for academic underachievement compared to their typically developing peers. Understanding their greatest strengths and challenges at school, and how these can be supported, is vital in order to develop focused classroom interventions. Ten primary school pupils with ADHD (aged 6-11 years) and their teachers (N = 6) took part in semi-structured interviews that focused on (1) ADHD knowledge, (2) the child's strengths and challenges at school, and (3) strategies in place to support challenges. Thematic analysis was used to analyse the interview transcripts and three key themes were identified; classroom-general versus individual-specific strategies, heterogeneity of strategies, and the role of peers. Implications relating to educational practice and future research are discussed.

Friendships in Children with Williams Syndrome: Parent and Child Perspectives.

Although children with Williams syndrome (WS) are strongly socially motivated, many have friendship difficulties. The parents of 21 children with WS and 20 of the children themselves participated in a semi-structured interview about the children's friendships. Parents reported that their child had difficulties sustaining friendships and low levels of interaction with peers. Barriers to friendships included difficulties with play and self-regulating behaviour. However, there was within-group variability, with a small number of children reported to have strong friendships. While parents reported friendship challenges, all of the children named at least one friend, and most said that they had never felt excluded by their peers. Future research is needed to determine optimal ways to support children with WS in their friendships.

Neurobehavioral follow-up of children exposed to selective serotonin reuptake inhibitors in utero.

BACKGROUND: Systematic data regarding long-term neurobehavioral effects of maternal antidepressant use during pregnancy are sparse. The aim of this study was to evaluate the impact of gestational exposure to antidepressants on later neurodevelopmental function. METHODS: This study describes a cohort of mother-child dyads (44 mothers, 54 children) in which maternal depressive symptoms and medication exposures were prospectively collected across pregnancy and the postpartum period. Children age 6 to 17 were assessed using validated instruments across domains of childhood behavior and executive memory and functioning. RESULTS: No associations were found between maternal use of selective serotonin reuptake inhibitors (SSRIs) during pregnancy and atypical neurodevelopment of children. Borderline clinical or clinical ranges of internalizing symptoms were associated with exposure to a higher maternal depressive symptom burden during pregnancy compared with those in the normal range. Compared with age- and sex-matched controls, the SSRI-exposed group showed superior performance on executive function tasks; findings did not demonstrate elevated risk for abnormal neurodevelopment in children age 6 to 17 exposed to SSRIs in utero. Deviations from the norm were instead associated with higher in utero exposure to maternal depression burden. CONCLUSIONS: This study highlights the need for rigorous studies of long-term outcomes after fetal antidepressant exposure.

A systematic review of the rates of depression in autistic children and adolescents without intellectual disability.

OBJECTIVES: Increasing evidence suggests that major depressive disorder (MDD) is highly prevalent in autism spectrum disorder (ASD). The current study is a systematic review of rates of depression in autistic children and adolescents, without intellectual disability. DESIGN: Adhering to PRISMA guidelines, a total of 14,557 studies were identified through five databases (MEDLINE, EMBASE, Cinahl, ERIC, PsycINFO, and Web of Science). METHODS: Articles were screened for inclusion and exclusion criteria and 10% double coded at each stage. Nineteen studies met criteria and were retained in the review. RESULT: The reported rates of depression in autistic children and adolescents varied from 0% to 83.3%. We discuss these findings in relation to method of report (self/informant, interview/questionnaire), recruitment status (clinical/community recruited), and age (pre-pubertal/adolescent). CONCLUSION: Rates of depression vary considerably across studies and do not show a particular pattern in relation to methodology, or age. Our research joins a crucial call to action from the research community for future research to improve the identification of depression in autism, which in turn will aid our understanding of the potentially different characterization and manifestation of depression in autism, to ultimately improve assessment and treatment of depression in autistic children and adolescents. PRACTITIONER POINTS: Rates of depression in autistic children and adolescents vary and do not show a particular pattern in relation to methodology or age. Our research joins the call to action from the research community for future research to improve the identification of depression in autistic children and adolescents, which in turn will aid understanding of depression in autism, and ultimately improve assessment and treatment of depression in autistic children and young people. The development of new measures of depression, specifically designed with, and for, children and adolescents with autism, is warranted.

Relationships between cognition and literacy in children with attention-deficit/hyperactivity disorder: A systematic review and meta-analysis.

Evidence suggests that cognitive and literacy difficulties are common for children with Attention-Deficit/Hyperactivity Disorder (ADHD). The current systematic review and meta-analysis investigated the relationship between cognition and literacy in children with ADHD. Ten thousand and thirty-eight articles were screened against the inclusion criteria and six eligible studies were retained for final review. Where two or more studies used comparable measures of cognition and literacy, a meta-analysis of the relationship between these measures was undertaken. A narrative synthesis of all included studies was also completed. There were medium effect sizes between working memory and aspects of reading, and small effect sizes between processing speed and reading. Inhibition and attention had differential relationships with aspects of literacy with varying effect sizes. This systematic review demonstrates differential relationships between aspects of literacy and cognition in children with ADHD. Further examination of these relationships is warranted to support intervention development.

[Formula: see text]The relationship between cognition and mathematics in children with attention-deficit/hyperactivity disorder: a systematic review.

Cognitive processes play an imperative role in children's mathematics learning. Difficulties in cognitive functioning are a core feature of Attention Deficit Hyperactivity Disorder (ADHD) in children, who also tend to show lower levels of mathematics attainment than their typically developing peers. This review (registration number: CRD42020169708) sought to aggregate findings from studies assessing the relationship between cognition and mathematics in children with a clinical ADHD diagnosis aged 4-12 years. A total of 11,799 studies published between 1992 and August 2020 were screened for eligibility using various database (PsycINFO, PubMed, SCOPUS, EMBASE, ERIC, Web of Science, and additional sources), from which four studies met inclusion criteria. A narrative synthesis was conducted on the correlations between mathematics and cognitive domains, including an evaluation of the risk of bias within the studies. Across four studies meeting inclusion criteria, memory, inhibitory control, and processing speed were assessed. The results showed a positive association between cognition and mathematics performance in this population. The strength of associations across these studies varied as a function of the cognitive domain in question, means by which mathematics performance was assessed, as well as whether confounding factors such as age and IQ were controlled for. Collectively, this review demonstrates a lack of research in this area and points to various methodological considerations for identifying the association between cognition and mathematics performance in ADHD.

Editorial: Evidence Concerning Dose-Dependent Effects of Stimulants on Neurocognitive Function in Children With Attention-Deficit/Hyperactivity Disorder.

The question of how stimulants affect cognitive function in children with attention-deficit/hyperactivity disorder (ADHD) is a challenging one that has been investigated across many studies. Part of the challenge lies in the difficulty of examining the range of cognitive functions that are now evidenced as areas of difficulty within a single study. A lack of studies examining the long-term effects of medication has also challenged advancement of knowledge in this area. When the available research is integrated, what is the conclusion regarding effects of stimulants on neurocognitive function?

Peer Relationships in Children with Williams Syndrome: Parent and Teacher Insights.

Although children with Williams syndrome (WS) are reported to show a strong motivation towards social interaction, evidence suggests many experience difficulties with peer relations. Less is known regarding the characteristics of such difficulties. Parents and teachers of 21 children with WS (7- to 16 years) completed questionnaires measuring aspects of social functioning and peer interactions. Parents and teachers reported that children with WS demonstrated significantly greater peer problems than population norms, including difficulties sustaining friendships and increased social exclusion. More substantial social functioning difficulties were associated with greater peer relation problems. The study provides multi-informant evidence of peer relationship difficulties in children with WS that require further consideration within the broader WS social phenotype.

Immediate impact of fantastical television content on children's executive functions.

Recent research has suggested that particular content of television programmes, such as watching fantastical scenes, can have negative consequences on cognitive functions in young children. We examined the effects of watching fantastical programmes on executive functions measured at both pre- and post-television viewing. Eighty 5- to 6-year-old children participated and were randomized into either fantastical or non-fantastical conditions. They completed inhibition, working memory, cognitive flexibility, and planning tasks both before and after watching either the brief fantastical or non-fantastical television clip. Whilst there were no differences between the groups at pre-test on any of the cognitive measures, children in the fantastical condition were poorer on inhibition, working memory, and cognitive flexibility tasks at the post-test session. Watching fantastical television content, even briefly, seems to disrupt cognitive function performance in young children across a broad range of aspects of executive function. Statement of contribution What is already known on this subject? Exposure to fantastical content within a television programme may impair executive functions in young children. What does this study add? Exposure to fantastical content within television programmes impairs executive functions in children of early primary school age. Impairment extends to all three core aspects of executive functions. Watching fantastical clips slows down planning performance without improving accuracy.

Developmental changes in executive functions during adolescence: A study of inhibition, shifting, and working memory.

The development of executive functions (EFs) has primarily been studied among younger children, despite research suggesting that particular aspects of EFs continue to develop throughout adolescence and into adulthood. This study investigated whether EFs continue to develop during the later stages of adolescence: three related, yet separable EF components - inhibition, shifting, and working memory - were examined in a cross-sectional sample of 347 adolescents (aged 14-18 years). After adjusting for covariates, age was found to be a significant predictor of pupils' performance on the inhibition but not the shifting or working memory tasks, suggesting different developmental trajectories for the three EF components. Controlling for non-executive processes implicated in performing the inhibition and working memory tasks had the most pronounced effect on the relationship between performance on those tasks and age. Finally, socioeconomic status was a significant predictor of performance on all tasks. Implications for research and practice are discussed. Statement of contribution What is already known on this subject? Brain regions associated with EFs continue to mature throughout adolescence, implying ongoing development of EFs. Behavioural studies demonstrate that certain EFs have not yet reached their adult levels in early adolescence. What the present study adds Changes in inhibition, but not shifting or working memory task performance, are evident among older adolescents. Lower-order processes tapped by EF tasks act as confounds in the relationship between age and task performance. Socioeconomic status is a significant predictor of adolescents' performance on EF tasks.

Reflective pondering is associated with executive control for emotional information: An adolescent prospective study.

BACKGROUND AND OBJECTIVES: In adult populations, rumination and executive control impairments have been highlighted as vulnerability factors for later depression and rumination as a whole construct has recently been linked to lower executive control. However, research with adolescent populations is limited and little is known developmentally of the association between rumination and executive control. A prospective design was used to investigate the relationship between brooding rumination and reflective pondering and executive control for emotional and non-emotional material in adolescence, whilst controlling for the effects of depression and anxiety symptoms. METHODS: The present study examined the relationship between the subcomponents of rumination and executive control for emotional and non-emotional information, within an adolescent development. A total of 149 adolescents (13-16 years) were tested at two time points, approximately six months between sessions. At each time point, participants completed a computerised, valenced measure of executive control and measures of brooding rumination, reflective pondering, depression symptoms and anxiety symptoms. RESULTS: Findings indicate that reflective pondering was predictive of greater executive control for processing emotional information over time. Contrary to research with adults, brooding rumination was not associated with executive control. LIMITATIONS: This study, conducted across two time points 6 months apart, awaits confirmation from further research across multiple time points and different intervals. CONCLUSIONS: Reflective pondering may act as a protective factor against later impairment in executive control.

A prospective investigation of rumination and executive control in predicting overgeneral autobiographical memory in adolescence.

The CaR-FA-X model (Williams et al., 2007), or capture and rumination (CaR), functional avoidance (FA), and impaired executive control (X), is a model of overgeneral autobiographical memory (OGM). Two mechanisms of the model, rumination and executive control, were examined in isolation and in interaction in order to investigate OGM over time. Across two time points, six months apart, a total of 149 adolescents (13-16 years) completed the minimal-instruction autobiographical memory test, a measure of executive control with both emotional and nonemotional stimuli, and measures of brooding rumination and reflective pondering. The results showed that executive control for emotional information was negatively associated with OGM, but only when reflective pondering levels were high. Therefore, in the context of higher levels of reflective pondering, greater switch costs (i.e., lower executive control) when processing emotional information predicted a decrease in OGM over time.

A narrative synthesis of the applicability of the CaR-FA-X model in child and adolescent populations: a systematic review.

The CaR-FA-X model [Williams, J. M. G., Barnhofer, T., Crane, C., Hermans, D., Raes, F., Watkins, E., … Dalgleish, T. (2007). Autobiographical memory specificity and emotional disorder. Psychological Bulletin, 133(1), 122-148. doi: 10.1037/0033-2909.133.1.122 ] is the most prominent and comprehensive model of overgeneral autobiographical memory (OGM) and provides a framework for OGM. The model comprises of three mechanisms, capture and rumination, functional avoidance and impaired executive control. These can independently, or in interaction, account for OGM. This systematic review aims to evaluate the existing research on the CaR-FA-X model, and trauma exposure studies specific to child and adolescent populations. The following databases were searched: "PsychInfo", "PsychArticles", "PubMed", "Web of Science", "Medline", "SCOPUS" and "Embase" for English-language, peer-reviewed papers with samples

Executive functions predict conceptual learning of science.

We examined the relationship between executive functions and both factual and conceptual learning of science, specifically chemistry, in early adolescence. Sixty-three pupils in their second year of secondary school (aged 12-13 years) participated. Pupils completed tasks of working memory (Spatial Working Memory), inhibition (Stop-Signal), attention set-shifting (ID/ED), and planning (Stockings of Cambridge), from the CANTAB. They also participated in a chemistry teaching session, practical, and assessment on the topic of acids and alkalis designed specifically for this study. Executive function data were related to (1) the chemistry assessment which included aspects of factual and conceptual learning and (2) a recent school science exam. Correlational analyses between executive functions and both the chemistry assessment and science grades revealed that science achievements were significantly correlated with working memory. Linear regression analysis revealed that visuospatial working memory ability was predictive of chemistry performance. Interestingly, this relationship was observed solely in relation to the conceptual learning condition of the assessment highlighting the role of executive functions in understanding and applying knowledge about what is learned within science teaching.

A comprehensive investigation of memory impairment in attention deficit hyperactivity disorder and oppositional defiant disorder.

BACKGROUND: We conducted a comprehensive and systematic assessment of memory functioning in drug-naïve boys with attention deficit hyperactivity disorder (ADHD) and oppositional defiant disorder (ODD). METHODS: Boys performed verbal and spatial working memory (WM) component (storage and central executive) and verbal and spatial storage load tasks, and the spatial span, spatial executive WM, spatial recognition memory and verbal recognition memory tasks from the Cambridge Neuropsychological Test Automated Battery. Groups comprised: (a) ADHD only (N = 21); (b) ADHD+ODD (N = 27); (c) ODD only (N = 21); and (d) typically developing (TYP) boys (N = 26). Groups were matched for age (M = 9.7 years) and sex (all boys). RESULTS: Confirmatory factor analyses confirmed the presence of five factors: verbal functioning, spatial functioning, WM storage, WM central executive and long-term memory (LTM). All three clinical groups demonstrated impaired memory performance. Boys with ODD and ODD+ADHD but not ADHD alone performed poorly on verbal memory tasks, whilst all three clinical groups showed impaired performance on spatial memory tasks. All three clinical groups performed poorly on the storage and central executive WM factors and the LTM factor. CONCLUSIONS: ADHD and ODD are characterised by impaired performance storage and central executive WM tasks and LTM tasks. This is, we believe, the first report of impaired WM and LTM performance in ODD. This study suggests that verbal memory difficulties are more closely associated with ODD than ADHD symptoms and that combined ADHD+ODD represents a true comorbidity. The data also support a small but growing number of suggestions in the literature of impaired LTM in ADHD.