Reduced Nogo-P3 in adults with developmental coordination disorder (DCD)

Area of Science:

• Neuroscience
• Developmental Psychology
• Motor Control

Background:

• Nogo-N2 and Nogo-P3 are event-related potential components linked to cognitive processes preceding and inhibiting motor responses, respectively.
• Developmental Coordination Disorder (DCD) is characterized by motor clumsiness, impacting motor skill development and execution.
• Understanding the neural underpinnings of response inhibition in DCD is crucial for targeted interventions.

Purpose of the Study:

• To investigate the influence of motor clumsiness associated with DCD on Nogo-N2 and Nogo-P3 components during a Go/Nogo task.
• To examine how response inhibition is affected by varying Nogo stimulus frequency in individuals with and without DCD.

Main Methods:

• Eighty-one healthy adults were classified into control and DCD groups using the Movement Assessment Battery for Children Second Edition.
• Participants performed a Go/Nogo task with response inhibition difficulty manipulated by rare (20%) and frequent (80%) Nogo stimuli.
• Electroencephalograms (EEGs) were recorded to calculate Nogo-N2 and Nogo-P3 amplitudes.

Main Results:

• The DCD group exhibited a significantly higher commission error rate in the rare Nogo condition compared to the control group.
• No significant differences in Nogo-N2 were observed between the DCD and control groups.
• Nogo-P3 amplitude was significantly reduced in the DCD group during the rare Nogo condition.

Conclusions:

• Motor clumsiness in DCD impairs performance on tasks requiring response inhibition, particularly when inhibition demands are high.
• The findings suggest that motor clumsiness primarily affects the cognitive processes involved in inhibiting an initiated motor response (Nogo-P3), rather than earlier conflict monitoring (Nogo-N2).
• This highlights a specific deficit in response inhibition mechanisms within the motor system in individuals with DCD.