In this startling and thought-provoking book, which will remind readers of works by Oliver Sacks and Atul Gawande, a world-renowned neuroscientist reveals his controversial, groundbreaking work with patients whose brains were previously thought vegetative or non-responsive but turn out—in up to 20 percent of cases—to be vibrantly alive, existing in the “Gray Zone.” Into the Gray Zone takes readers to the edge of a dazzling, humbling frontier in our understanding of the brain: the so-called “gray zone” between full consciousness and brain death. People in this middle place have sustained traumatic brain injuries or are the victims of stroke or degenerative diseases, such as Alzheimer’s...