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Episodic migraine (EM) may evolve into disabling chronic migraine (CM). The progression is elusive but may be underpinned by central excitability change. Recently, several studies have investigated visual cortex excitability in different migraine disorders using magnetoencephalography, a technique superior to traditional scalp electroencephalography in measuring cortical excitability. These studies...
Episodic migraine (EM) may evolve into the more disabling chronic migraine (CM, monthly migraine days⩾8 and headache days⩾15) with unknown mechanism. Aiming to elucidate the pathophysiology of CM and its relationship with EM, this study characterized the visual cortical responses in CM and EM. Neuromagnetic visual-evoked responses to left-hemifield checkerboard reversals were obtained in patients...
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