The investigators aim to assess and compare neurophysiological and biochemical changes induced by a 3-month treatment with atogepant (60 mg daily) in patients with high-frequency episodic migraine (8-14 monthly migraine days). Evaluations will include neurophysiological assessments (High-Density EEG, nociceptive reflexes, and visual evoked potentials) and biomolecular profiling (gene expression of endocannabinoid catabolizing enzymes, CGRP and PACAP plasma levels, and headache-specific microRNAs). Outputs will contribute to defining predictors of atogepant response, elucidating its effects on brain connectivity, excitability, and CGRP/endocannabinoid pathways, and identifying alternative therapeutic targets for non-responders.