How Breath Changes the Mind examines the neuroscience and physiology of breathwork, altered states of consciousness, and voluntary state change.
Breathing occupies an unusual position in human biology. It is regulated automatically, yet it can also be deliberately altered. Changes in respiratory rate, depth, route, rhythm, and breath retention can affect carbon dioxide, blood pH, cerebral blood flow, cardiovascular timing, interoception, neural activity, attention, emotion, and subjective experience.
Drawing on research in respiratory physiology, neuroscience, consciousness studies, meditation, hypnosis, psychedelics, and breathwork, Dr. Juan Carlos Rey develops a scientific framework for understanding how changes in breathing can alter the physiological conditions under which conscious experience occurs.
Rather than treating breathwork as a single technique, the book separates its underlying variables and examines their distinct effects. Topics include respiratory rhythm generation, chemoreception, carbon dioxide and oxygen regulation, autonomic activity, respiratory-linked neural oscillations, body ownership, self-location, time perception, agency, imagery, catharsis, altered-state phenomenology, experimental design, safety, recovery, and the emerging study of respiratory phenotypes.
The book carefully distinguishes measured physiology, reported experience, association, clinical outcomes, mechanistic evidence, interpretation, and scientific inference. It also addresses common misconceptions surrounding hyperventilation, trauma release, vagal regulation, psychedelic comparison, and the meaning of intense subjective experiences.
Written for researchers, clinicians, breathwork practitioners, educators, students, and scientifically curious readers, How Breath Changes the Mind offers a rigorous framework for understanding respiration as one of the human nervous system’s most accessible pathways for voluntary state change.
