Headache Related Alterations of Visual Processing in Migraine Patients

•Visually-induced feedback and feedforward signalling is altered in migraine.•Interictal episodic migraine patients show increased feedback to the visual cortex.•Ictal episodic and chronic migraine patients show augmented feedforward activity.•Electrophysiologically, chronic migraineurs resemble ictal episodic migraine patients.•All headaches in migraine patients have a similar electrophysiological background.