EEG microstates in epilepsy with and without cognitive dysfunction: Alteration in intrinsic brain activity

Area of Science:

• Neuroscience
• Clinical Neurology
• Computational Psychiatry

Background:

• Epilepsy frequently co-occurs with cognitive dysfunction, impacting patient prognosis and quality of life.
• Understanding the neural underpinnings of cognitive impairment in epilepsy is crucial for developing targeted interventions.

Purpose of the Study:

• To investigate the electroencephalography (EEG) microstate differences between epilepsy patients with and without comorbid cognitive dysfunction.
• To identify potential EEG biomarkers for cognitive dysfunction in epilepsy.

Main Methods:

• Participants were categorized into those with epilepsy and cognitive dysfunction (PCCD) and those without (nPCCD).
• 20-channel EEG data were analyzed using microstate analysis to assess dynamic brain activity.
• Key metrics included microstate coverage, occurrence, duration, and transition probabilities.

Main Results:

• Patients with epilepsy and cognitive dysfunction (PCCD) exhibited increased occurrence and coverage of microstate B compared to nPCCD.
• PCCD patients showed reduced coverage of microstate D.
• Transition probabilities differed, with higher A to B and B to A transitions and lower A to D and D to A transitions in the PCCD group.

Conclusions:

• EEG microstate analysis reveals significant differences in brain dynamics between epilepsy patients with and without cognitive dysfunction.
• These findings suggest EEG microstates are a valuable tool for assessing neuropsychiatric disorders and understanding the mechanisms of cognitive changes in epilepsy.