Abstract

The number of sound-induced flash illusions (SIFI) perceived are related with the level of visual cortex (V1) excitability. In episodic migraineurs, in response to visual-acoustic illusions, V1 is hyperexcitable. The injection of botulinum toxin type A was approved as a therapy for chronic migraine (CM). Recent studies have correlated the action of botulinum toxin with the release of CGRP and cortical excitability. We used SIFI to evaluate the V1 excitability in CM at baseline and 3 months after treatment with botulinum toxin.

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