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Abnormal rhythmic motor response in children with attention-deficit-hyperactivity disorder
Hilla Ben-Pazi1, Varda Gross-Tsur, Hagai Bergman
1Neuropediatric Unit, Shaare Zedeck Medical Center, PO 3235, Jerusalem 91031, Israel. shmaryaho@hotmail.com
Developmental Medicine and Child Neurology
|October 29, 2003
Summary
Children with attention-deficit-hyperactivity disorder (ADHD) exhibit motor control issues linked to abnormal neuronal oscillations. This study found ADHD children struggle with rhythmic motor tasks, suggesting a shared mechanism with Parkinson's disease.
Area of Science:
- Neuroscience
- Developmental Psychology
- Movement Disorders
Background:
- Attention-deficit-hyperactivity disorder (ADHD) is associated with motor control deficits.
- These motor abnormalities may stem from impaired neuronal oscillatory mechanisms crucial for motor timing.
Purpose of the Study:
- To investigate motor temporal regulation in children with ADHD.
- To assess rhythmic motor activity abnormalities using a finger-tapping test.
Main Methods:
- A finger-tapping test was administered to 27 children with ADHD and 33 controls (ages 6-14).
- Participants responded to rhythmic stimuli at frequencies from 1 to 6 Hz.
- Children on methylphenidate were medication-free during testing.
Main Results:
- Most children with ADHD maintained a constant tapping rate irrespective of stimulus frequency.
- This pattern of rhythmic instability was infrequent in the control group.
- The observed error pattern resembles that seen in Parkinson's disease.
Conclusions:
- Children with ADHD demonstrate abnormal motor pacing, suggesting underlying neuronal oscillatory dysfunction.
- This dysfunction may involve dopaminergic fronto-striatal pathways, potentially linking ADHD pathophysiology to that of Parkinson's disease.