CHICAGO (Reuters) - A man with severe brain injuries who spent six years in a near-vegetative state can now chew his food, watch a movie and talk with family thanks to a brain pacemaker that may change the way such patients are treated, U.S. researchers said on Wednesday. The 38-year-old man is the first person in a minimally conscious state to be treated with deep-brain stimulation, a treatment that uses a pacemaker and two electrodes to send impulses into a part of the brain regulating consciousness.