[Mirror Movement]

Area of Science:

• Neurology
• Developmental Neuroscience
• Movement Disorders

Background:

• Mirror movement (MM) involves involuntary symmetrical movements in the limb contralateral to a voluntary movement.
• This phenomenon is typically present in early childhood and usually resolves as motor control develops.
• Persistent or abnormal MM can indicate underlying neurological conditions, including hereditary, congenital, or acquired causes.

Purpose of the Study:

• To explore the phenomenon of mirror movements (MM).
• To understand the developmental trajectory and potential neurological underpinnings of MM.
• To review associated neurological disorders and implicated brain regions.

Main Methods:

• Literature review of studies on mirror movements.
• Analysis of reported cases linking MM to neurological disorders.
• Review of proposed pathomechanisms for MM.

Main Results:

• Mirror movement is a normal developmental phase in children, typically disappearing with maturation.
• Persistent MM is considered abnormal and associated with various neurological disorders.
• Lesions in the supplementary motor area, corpus callosum, and cervical regions are implicated in MM.

Conclusions:

• The persistence of mirror movements beyond typical development suggests underlying neurological abnormalities.
• Abnormal MM may stem from disruptions in descending corticospinal pathways.
• Impaired cortical and subcortical motor control systems are also hypothesized to contribute to the pathomechanism of MM.