Taken together , the studies pointed at substantial evidence for a negative association between ADHD symptoms and mathematical ability .
This association was particularly marked for the inattentive component of ADHD than for the hyperactive-impulsive component .
Evidence from twin studies also showed a significant genetic correlation between mathematics and ADHD , which was greater for the inattentive component of ADHD compared to the hyperactive-impulsive component .
Conclusions The differential relationship of the hyperactivity-impulsivity and inattention domains with mathematics emphasises the heterogeneity within the disorder and suggests a partially different aetiology of the two ADHD domains .
Background Several recent behavioural and behavioural genetic studies have investigated the relationship between attention deficit hyperactivity disorder ( ADHD ) and mathematical ability .
The aim of this systematic review was to provide an overview of these studies to date .
An emphasis was placed on review ing results that explored the association between mathematics and the two ADHD components of attention and hyperactivity-impulsivity separately .
Aetiological relationship between language performance and autistic-like traits in childhood: a twin study.
BACKGROUND Impairments in language and communication are core features of autism spectrum disorders ( ASDs ) . The basis for this association is poorly understood . How early language is related to each of the triad of impairments characteristic of ASDs is also in need of clarification . AIMS This is the first study that aims to determine the extent to which shared genetic and environmental factors underlie the association between  early language performance and autistic-like traits ( ALTs ) in middle childhood . METHODS & PROCEDURES Data came from a population -based twin sample ( n = 6087 pairs ) assessed prospect ively at 2 , 3 , 4 and 8 years .  ALTs  measured by the Childhood Asperger Syndrome Test ( CAST )  at 8 years were investigated in relation to language assessed by the MacArthur Communicative Development Inventory ( CDI ) at 2 , 3 and 4 years . Multivariate model fitting techniques were used to analyse the origins of this association . OUTCOMES & RESULTS Total CAST scores , as well as Social and Communication subscales , at 8 years were weakly but significantly negatively correlated with language ability at 2 , 3 and 4 years . Correlations between language and restrictive and repetitive behaviours and interests ( RRBI ) were not significant . The phenotypic correlations between language and Social and Communication ALTs were almost entirely mediated by shared genetic influences . There were specific genetic influences on early language that were not shared with ALTs , and specific genetic influences on ALTs not shared with earlier language performance . CONCLUSIONS This is the first study to demonstrate shared genetic influences in relation to language performance as an early antecedent of later ALTs . These results support the idea that the triad of core features in ALTs are aetiologically heterogeneous , with early language relating to social and communication impairments but not RRBIs
Taken together , the studies pointed at substantial evidence for a negative association between ADHD symptoms and mathematical ability .
This association was particularly marked for the inattentive component of ADHD than for the hyperactive-impulsive component .
Evidence from twin studies also showed a significant genetic correlation between mathematics and ADHD , which was greater for the inattentive component of ADHD compared to the hyperactive-impulsive component .
Conclusions The differential relationship of the hyperactivity-impulsivity and inattention domains with mathematics emphasises the heterogeneity within the disorder and suggests a partially different aetiology of the two ADHD domains .
Background Several recent behavioural and behavioural genetic studies have investigated the relationship between attention deficit hyperactivity disorder ( ADHD ) and mathematical ability .
The aim of this systematic review was to provide an overview of these studies to date .
An emphasis was placed on review ing results that explored the association between mathematics and the two ADHD components of attention and hyperactivity-impulsivity separately .