Goal-directed upper limb movements by children with and without DCD: a window into perceptuo-motor dysfunction?

Area of Science:

• Neuroscience
• Developmental Psychology
• Kinesiology

Background:

• Developmental co-ordination disorder (DCD) affects at least 6% of school-aged children.
• Motor deficits in DCD are linked to perceptual and cognitive processes, though research is limited.
• This study examines perceptual-motor abilities in children with and without DCD.

Purpose of the Study:

• To investigate visual, kinaesthetic, and cross-modal judgement abilities in children with DCD.
• To compare perceptual-motor performance between children with and without DCD.
• To identify potential sensory processing differences contributing to DCD.

Main Methods:

• Cross-sectional study design with 18 children (9 with DCD, 9 controls), aged 6 years.
• Participants performed aiming tasks under varying visual and kinaesthetic conditions.
• Three-dimensional motion analysis measured trajectory length, endpoint error, and movement time.

Main Results:

• Children with DCD exhibited larger endpoint errors, longer movement times, and greater trajectory lengths than controls.
• Both groups showed increased errors and movement times in non-visually guided tasks.
• The typical visual advantage was diminished in children with DCD.

Conclusions:

• Children with DCD demonstrate significant deficits in speed, accuracy, and trajectory planning across sensory conditions.
• Absence of vision exacerbated performance decrements in all children, but more so in the DCD group.
• Findings suggest potential visual and kinaesthetic processing impairments in children with DCD.