New fMRI study by Tanabe et al. published in the March 2020 issue of the journal Anesthesiology suggests that the global temporal coordination of neuronal activity across the entire brain is a unitary indicator of various states of consciousness including sleep, general anesthesia, and unresponsive wakefulness syndrome, whereas the relationship of the global and local brain activity defines the particular quality of each unconscious state. 

Article Disrupted Global Brain Signal Indicates Unconsciousness

Video Disrupted Global Brain Signal During Unconsciousness