Resilience in migraine brains: decrease of coherence after photic stimulation.

Area of Science:

• Neuroscience
• Medical Imaging

Background:

• Migraine is often accompanied by photophobia and phonophobia, leading patients to seek reduced sensory input.
• Migraineurs may possess an inherent predisposition in sensory cortical processing, potentially indicated by altered neuronal network coherence.

Purpose of the Study:

• To quantify cortical partial directed coherence (PDC) in electroencephalographic (EEG) recordings of migraine patients and controls.
• To investigate differences in brain activity between migraineurs and healthy individuals under basal and photic stimulation conditions.

Main Methods:

• EEG recordings were obtained from 11 women with migraine with visual aura and 7 healthy women.
• Recordings were performed in a basal state and during photic stimulation to assess cortical coherence.

Main Results:

• Migraine patients displayed greater cortical coherence than controls in the basal state, suggesting a predisposition to sensory processing.
• Photic stimulation led to decreased cortical coherence in migraine patients, whereas controls showed an increase.

Conclusions:

• Migraineurs exhibit increased cortical coherence before photic stimulation, which decreases upon stimulation, potentially indicating a resilience mechanism.
• Partial directed coherence (PDC) analysis can generate a "coherence map" for migraine management and treatment monitoring.