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Brain MRI: MRI brain scan (in the axial planeâthat is, slicing from front-to-back and side-to-side through the head) showing a brain tumor at the bottom right. The fMRI is a series of MRIs that measures both the structure and the functional activity of the brain through computer adaptation of multiple images.
The reticular activating system is located in the brain stem. Brain scans are used to observe the reticular activating system's role during sleep and dreaming. Sleep control is the domain of the reticular activating system. Trauma to the RAS area has been linked to narcolepsy.