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Neural correlates underlying micrographia in Parkinson's disease.

Tao Wu1, Jiarong Zhang2, Mark Hallett3

  • 11 Department of Neurobiology, Key Laboratory on Neurodegenerative Disorders of Ministry of Education, Beijing Institute of Geriatrics, Xuanwu Hospital, Capital Medical University, Beijing, China 2 Beijing Key Laboratory on Parkinson's Disease, Parkinson Disease Centre of Beijing Institute for Brain Disorders, Beijing, China wutao69@gmail.com.

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PubMed
Summary

Micrographia in Parkinson's disease involves reduced handwriting. Consistent micrographia links to basal ganglia issues, while progressive micrographia also involves cerebellum and motor cortex disconnections. Attention helps both types.

Keywords:
Parkinson’s diseaseattentiondopaminergic interventionmicrographiasequence effect

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Area of Science:

  • Neuroscience
  • Neurology
  • Movement Disorders

Background:

  • Micrographia, a common Parkinson's disease (PD) symptom, presents as reduced handwriting.
  • The underlying neural mechanisms of micrographia remain incompletely understood.
  • Understanding these mechanisms is crucial for developing targeted interventions.

Purpose of the Study:

  • To investigate neural activity and connectivity in micrographia using functional magnetic resonance imaging (fMRI).
  • To examine the effects of attention and dopaminergic medication (levodopa) on micrographia.
  • To differentiate neural correlates between consistent and progressive micrographia.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was employed to assess brain activity and connectivity.
  • Participants with Parkinson's disease and micrographia underwent fMRI scans.
  • The study examined the impact of attentional strategies and levodopa administration on neural patterns.

Main Results:

  • Consistent micrographia correlated with reduced basal ganglia motor circuit activity and connectivity.
  • Progressive micrographia involved basal ganglia dysfunction plus disconnections in motor areas (SMA, CMA) and cerebellum.
  • Attention improved both micrographia types by engaging the anterior putamen and dorsolateral prefrontal cortex.
  • Levodopa improved consistent micrographia by enhancing basal ganglia function but did not affect progressive micrographia.

Conclusions:

  • Consistent micrographia is primarily linked to basal ganglia motor circuit dysfunction.
  • Progressive micrographia arises from combined basal ganglia dysfunction and disrupted connectivity in specific motor control networks.
  • Attention recruits additional brain networks to ameliorate micrographia, while levodopa's efficacy is limited to consistent forms, likely due to its inability to repair network disconnections.