Motor, visual and egocentric transformations in children with Developmental Coordination Disorder.

Area of Science:

• Neuroscience
• Developmental Psychology
• Motor Control

Background:

• The internal modelling deficit (IMD) hypothesis posits that children with Developmental Coordination Disorder (DCD) exhibit impaired internal action representation.
• DCD affects motor coordination and may involve deficits in motor imagery.

Purpose of the Study:

• To investigate the internal modelling deficit (IMD) hypothesis in children with DCD.
• To examine the role of motor imagery in DCD using a mental rotation paradigm.

Main Methods:

• Thirty-six children (18 with DCD) completed four tasks: hand rotation (with/without imagery instructions), whole-body imagery, and alphanumeric rotation.
• Performance was assessed based on response time and accuracy.

Main Results:

• Children with DCD showed no significant difference in the basic hand rotation task compared to controls.
• When explicit imagery instructions were provided, control children improved significantly, while DCD children did not, indicating an inability to utilize motor imagery cues.
• DCD children performed poorly on the whole-body imagery task, with accuracy near chance, while controls performed significantly better.
• No differences were observed between groups on the alphanumeric task, suggesting visual imagery was intact.

Conclusions:

• The findings partially support the IMD hypothesis, as children with DCD demonstrated difficulties with motor imagery tasks, particularly when explicit instructions were given.
• The results suggest that DCD may involve specific deficits in utilizing motor imagery for action representation.
• Further research is needed to determine if the IMD is a specific subgroup characteristic within DCD.