Richard Cytowic

Richard Cytowic is an American neurologist and author who has done more than perhaps any other scientist to bring the phenomenon of synesthesia to public and scientific attention. Born in 1952, Cytowic trained in neurology and practiced clinical medicine while pursuing his fascination with unusual perceptual experiences. His pioneering work established synesthesia not as a metaphor or affectation, but as a genuine, measurable neurological condition in which stimulation of one sense automatically triggers an experience in another.

His landmark book The Man Who Tasted Shapes, first published in 1993 and revised in subsequent editions, introduced synesthesia to a general readership through the gripping case study of Michael Watson, a man who experienced flavors as physical shapes he could feel with his hands. The book combined neuroscience, philosophy, and narrative in a way that captivated both specialists and lay readers, and it helped spark a renaissance of scientific interest in synesthesia that continues today. Cytowic argued that synesthesia offers a window into the emotional brain and the nature of conscious experience.

His subsequent book, Wednesday Is Indigo Blue: Discovering the Brain of Synesthesia (2009), co-authored with neuroscientist David Eagleman, provided an updated and more comprehensive account of the science. The book drew on decades of new research, including brain imaging studies, to explain the neural mechanisms underlying synesthetic experiences and their prevalence in the population. It remains one of the definitive popular treatments of the subject.

Cytowic has also written The Neurological Side of Neuropsychology, a clinical text, and has contributed widely to discussions of consciousness, perception, and what the brain’s stranger phenomena reveal about the nature of mind. His work sits at a compelling intersection of medicine, philosophy, and human experience.