『The Brain That Changes Itself』要約

In The Brain That Changes Itself, psychiatrist and psychoanalyst Norman Doidge surveys the science of neuroplasticity—the discovery that the adult brain is not fixed but can reorganize itself throughout life. Doidge structures the book around profiles of researchers and patients whose experiences overturned the older dogma that brain circuits, once damaged or set, could never be rewired. Among the central figures is Paul Bach-y-Rita, who pioneered sensory substitution, helping blind patients "see" through devices that translated camera images into tactile stimulation on the tongue or skin. Another is Edward Taub, whose constraint-induced movement therapy pushed stroke patients to regain use of paralyzed limbs by forcing the healthy limb to stay idle. Doidge also describes Michael Merzenich's work showing that the brain's cortical maps compete for territory and can be reshaped by training, and he recounts the story of a woman whose chronic balance problem was relieved through a device that gave her tongue feedback about her body's position. The book examines conditions ranging from stroke and cerebral palsy to phantom limb pain and obsessive-compulsive disorder, arguing that targeted practice and stimulation can drive measurable physical changes in neural connections. Doidge introduces ideas such as the "plastic paradox"—that the same malleability allowing recovery can also entrench habits and addictions—and draws on cases like patients learning to compensate for lost function through undamaged pathways. Published in 2007, the book became a bestseller for translating laboratory neuroscience into accessible narratives about recovery and learning. It remains a widely cited popular introduction to neuroplasticity, though some scientists have noted that its optimism occasionally outpaces the evidence.