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Differences between 'congenital mirror movements' and 'associated movements' in normal children: a neurophysiological
1Medizinische Einrichtungen der Heinrich-Heine-Universität, Zentrum für Kinderheilkunde, Düsseldorf, Germany.
Neuroscience Letters
|December 16, 1998
Summary
Congenital mirror movements (CMM) and physiological associated movements in children differ in their underlying brain mechanisms. CMM shows symmetrical motor cortex responses, unlike normal associated movements.
Area of Science:
- Neuroscience
- Developmental Pediatrics
- Motor Control
Background:
- Physiological associated movements are common in children up to age 10.
- Congenital mirror movements (CMM) are a clinically apparent form of associated motor activity.
- The precise physiological mechanisms differentiating these movements remain unclear.
Observation:
- This study utilized Transcranial Magnetic Stimulation (TMS) and kinematic analysis in a 4-year-old child with CMM.
- Data from the child with CMM were compared against a normative database of healthy children.
- Associated movements in normal children were assessed for comparison.
Findings:
- In the child with CMM, focal TMS induced symmetrical motor responses in both upper extremities.
- These responses exhibited identical latencies in ipsilateral and contralateral muscles.
- Kinematic analysis revealed precise, symmetrical onset of intended and unintended movements in CMM.
- Conversely, normal children displayed variable onset delays in associated movements between extremities.
Implications:
- The findings suggest distinct physiological mechanisms underlie CMM and physiological associated movements.
- This research contributes to understanding the neurodevelopment of motor control in childhood.
- Differentiating these movement types may aid in diagnosing and managing pediatric motor disorders.