Postural Control in Childhood: Investigating the Neurodevelopmental Gradient Hypothesis

Area of Science:

• Neuroscience
• Developmental Psychology
• Biomedical Engineering

Background:

• Neurodevelopmental disorders (NDDs) are hypothesized to exist on a continuum of severity.
• Postural stability is a complex function influenced by sensory integration and brain development.
• Understanding differences in postural control among NDDs can inform diagnostic and therapeutic approaches.

Purpose of the Study:

• To investigate postural stability in children and adolescents with NDDs compared to healthy controls.
• To test the hypothesis that NDDs lie on a gradient continuum based on postural control impairment.
• To differentiate postural control deficits across Autism Spectrum Disorder (ASD), Attention Deficit Hyperactive Disorder (ADHD), and Tourette Syndrome (TS).

Main Methods:

• A case-control study involving 104 participants aged 5-17 (81 with NDDs, 23 healthy controls).
• Assessment of postural stability using quantitative measures across various sensory conditions.
• Comparison of postural performance between clinical groups (ASD, ADHD, TS) and healthy controls.

Main Results:

• Autism Spectrum Disorder (ASD) exhibited the most significant postural instability compared to healthy controls.
• Attention Deficit Hyperactive Disorder (ADHD) showed impairments in complex sensory conditions, particularly affecting sway area.
• Tourette Syndrome (TS) performance was largely comparable to healthy controls, with ASD and ADHD groups showing greater deficits than TS.

Conclusions:

• Poor postural control may serve as a potential biomarker for neurodevelopmental risk assessment.
• Findings support the gradient hypothesis, indicating varying degrees of impairment across NDDs.
• Sensory system accuracy significantly impacts postural control in individuals with NDDs, especially ASD and ADHD.