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3D-Neuronavigation In Vivo Through a Patient's Brain During a Spontaneous Migraine Headache
Published on: June 2, 2014
The occipital cortex is hyperexcitable in migraine: experimental evidence
S K Aurora1, Y Cao, S M Bowyer
1Department of Neurology, Henry Ford Health Sciences Center, 2799 West Grand Boulevard, Detroit, MI 48202-2689, USA.
Headache
|March 31, 2001
Summary
Migraine patients exhibit lower thresholds for visual phosphenes and are more prone to visually triggered headaches compared to controls, indicating a hyperexcitable visual cortex.
Area of Science:
- Neuroscience
- Neurology
- Ophthalmology
Background:
- Migraine is associated with altered cortical excitability.
- Previous studies suggest a lower threshold for magnetophosphene generation in migraineurs.
Purpose of the Study:
- To compare the phosphene generation threshold using transcranial magnetic stimulation (TMS) in individuals with migraine versus controls.
- To assess the susceptibility to visually triggered headaches in migraineurs compared to controls.
Main Methods:
- TMS was applied to the occipital scalp to determine the phosphene threshold.
- Visual stimuli were presented during MRI to assess headache triggers.
- Participants included individuals with migraine (with and without aura) and healthy controls.
Main Results:
- A significantly higher proportion of migraineurs (86.7%) reported phosphenes compared to controls (25%).
- Migraineurs had a higher probability of headache triggered by visual stimuli (53%) versus controls (0%).
- A significant correlation was found between TMS phosphene threshold and visually triggered headaches.
Conclusions:
- Migraineurs demonstrate a lower threshold for occipital cortex excitability.
- A hyperexcitable visual cortex in migraine may predispose individuals to visually triggered headaches.
