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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.

Original publication




Journal article


J Autism Dev Disord

Publication Date





4367 - 4384


Attention deficit hyperactivity disorder, Autism spectrum disorder, Midline crossing, Motor ability, Reaching, Attention Deficit Disorder with Hyperactivity, Autism Spectrum Disorder, Cohort Studies, Female, Humans, Infant, Male, Motor Skills Disorders, Psychomotor Performance