Subtle Oculomotor Difficulties and their Relation to Motor Skill in Children with Autism Spectrum Disorder

Objectives Sensorimotor difficulties are often reported in autism spectrum disorders (ASD). Visual and motor skills are linked in
that the processing of visual information can help in guiding motor movements. The present study investigated oculomotor skill
and its relation to general motor skill in ASD by providing a comprehensive assessment of oculomotor control.
Methods Fifty children (25 ASD; 25 typically developing [TD]), aged 7–10 years, completed a motor assessment (comprising
fine and gross motor tasks) and oculomotor battery (comprising fixation, smooth pursuit, prosaccade and antisaccade tasks).
Results No group differences were found for antisaccade errors, nor saccade latencies in prosaccade and antisaccade tasks, but
increased saccade amplitude variability was observed in children with ASD, suggesting a reduced consistency in saccade
accuracy. Children with ASD also demonstrated poorer fixation stability than their peers and spent less time in pursuit of a
moving target. Motor skill was not correlated with saccade amplitude variability. However, regression analyses revealed that
motor skill (and not diagnosis) accounted for variance in fixation performance and fast smooth pursuit.
Conclusions The findings highlight the importance of considering oculomotor paradigms to inform the functional impact of
neuropathologies in ASD and also assessing the presentation of co-occurring difficulties to further our understanding of ASD.
Avenues for future research are suggested.