Abstract

We investigated infant’s manual motor behaviour; specifically behaviours crossing the body midline. Infants at elevated likelihood of Autism Spectrum Disorder (ASD) and/or Attention Deficit Hyperactivity Disorder (ADHD) produced fewer manual behaviours that cross the midline compared to infants with a typical likelihood of developing these disorders; however this effect was limited to 10-month-olds and not apparent at age 5 and 14 months. Although, midline crossing did not predict ASD traits, it was related to ADHD traits at 2 years of age. We rule out motor ability and hand dominance as possible explanations for this pattern of behaviour, positing that these results may be a consequence of multisensory integration abilities, and the neurobehavioural shift period, in the first year of life.

Highlights

  • Transdiagnostic approaches to neurodevelopmental disorders have gained increasing traction over the last decade (e.g., Livingston and Happé 2017; Rigney et al 2018; Peralta and Cuesta 2017)

  • We found that total midline crosses performed at 10 months significantly associated with Attention Deficit Hyperactivity Disorder (ADHD) traits on the Child Behaviour Checklist (CBCL) ­[R2 = 0.21, F(1, 91) = 4.26, p = 0.04, η2p = 0.04], with more contralateral behaviours related to greater ADHD traits

  • Including the entire EL sample and conducting nonparametric bivariate correlations, we found a significant relationship between total midline crossings and the CBCL ADHD subscale [r(94) = 0.21, p = 0.047] and a trend between total midline crossings and the Quantatitive Checklist for Autism in Toddlers (QChat) [r(94) = 0.16, p = 0.12]

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Summary

Introduction

Transdiagnostic approaches to neurodevelopmental disorders have gained increasing traction over the last decade (e.g., Livingston and Happé 2017; Rigney et al 2018; Peralta and Cuesta 2017).

Methods
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