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Inspiration drives CSF flow in the third ventricle. MRI signal intensity time courses for subjects 1 (#1, female, 43 years), 5 (#5, male, 19 years), and 6 (#6, male, 26 years) for a protocol comprising normal breathing (10 s) followed by eight periods of forced inspiration (black boxes = 2.5 s) and expiration (2.5 s) are shown. The two columns represent repeated measurements for each subject.
