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Resting-State Network Analysis Reveals Altered Functional Brain Connectivity in Essential Tremor.

Sheng-Min Huang1, Cheung-Ter Ong2, Yu-Ching Huang3,4

  • 1Institute of Biomedical Engineering and Nanomedicine, National Health Research Institutes, Miaoli, Taiwan.

Brain Connectivity
|June 14, 2024
PubMed
Summary

Essential tremor (ET) shows altered brain network connectivity, particularly reduced default mode and ventral attention network links. These changes correlate with tremor severity, suggesting ET involves widespread cerebral network dysfunction.

Keywords:
essential tremorfunctional connectivitymagnetic resonance imagingresting-state network

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Area of Science:

  • Neuroscience
  • Neurology
  • Medical Imaging

Background:

  • Essential tremor (ET) presents with motor and non-motor symptoms, but its underlying neuro-pathogenesis remains incompletely understood.
  • While cerebellar circuits are implicated, large-scale cerebral network connectivity in ET is not well-characterized.

Purpose of the Study:

  • To investigate alterations in functional connectivity and network properties within the cerebrum in patients with Essential Tremor.
  • To explore the relationship between resting-state network (RSN) metrics and clinical tremor features in ET.

Main Methods:

  • Resting-state functional magnetic resonance imaging (fMRI) was employed to assess inter- and intra-network connectivity and functional activity.
  • Amplitude of Low-Frequency Fluctuation (ALFF) was used to measure regional functional activity.
  • Correlation analyses examined the association between RSN metrics and tremor characteristics.

Main Results:

  • Patients with ET exhibited decreased connectivity between the default mode network and the ventral attention network compared to controls (p < 0.05).
  • Significant differences in ALFF were observed in brain regions associated with various RSNs (p < 0.05), with the ET group showing higher degree centrality.
  • Tremor features were significantly correlated with inter-network connectivity, ALFF, and degree centrality (|r| = 0.135–0.766).

Conclusions:

  • Resting-state fMRI reveals significant alterations in cerebral network connectivity in Essential Tremor.
  • These findings highlight a potentially valuable neuroimaging approach for understanding the cerebral network disruptions in ET.