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FILTER FLUB
View larger image | Though no one agrees on what causes migraines, Peter Goadsby of the University of California, San Francisco believes the brain stem is to blame. Normally, this region filters sensory inputs before passing them along to the thalamus and outer brain regions. In migraine sufferers, nerve signals pour unfettered into the rest of the brain. Credit: head: slowgogo/istockphoto; brain: takito/shutterstock

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