Persistent vegetative state/Definition
Vegetative state refers to the neurocognitive status of individuals with severe brain damage, in whom physiologic functions (sleep-wake cycles, autonomic control, and breathing) persist, but awareness (including all cognitive function and emotion) is abolished.
This definition is at least in part based on: Anonymous (2015), Persistent vegetative state (English). Medical Subject Headings. U.S. National Library of Medicine.