Fundamentally altered global- and microstate EEG characteristics in Huntington's disease

Area of Science:

• Neuroscience
• Biomedical Engineering

Background:

• Huntington's disease (HD) presents with complex psychiatric, cognitive, and motor symptoms.
• Understanding the underlying neurophysiological changes in HD is crucial for developing effective interventions.

Purpose of the Study:

• To investigate electroencephalography (EEG) global state and microstate alterations in individuals with HD.
• To explore the relationship between these EEG changes and cognitive/behavioral impairments in HD patients.

Main Methods:

• Compared EEG global state (connectivity, dimensionality) and microstate properties (duration, occurrence, coverage of classes A, B, C, D) between 20 unmedicated HD patients and 20 controls.
• Correlated EEG parameters with cognitive test scores in HD patients.

Main Results:

• HD patients exhibited reduced global brain connectivity and increased dimensionality with disease severity.
• Significant alterations in microstate parameters were observed, including increased coverage for classes A and B, and decreased occurrence/coverage for classes C and D.
• Disease severity and cognitive performance correlated with specific microstate parameter changes and increased dimensionality.

Conclusions:

• Global state changes suggest increased functional brain dissociation in HD.
• Microstate alterations may reflect neuronal loss and functional deficits in HD-related brain regions.
• Combined global and microstate EEG analyses offer valuable insights into progressive neurodegeneration in HD.