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Phantoms in the Brain: Probing the Mysteries of the Human Mind, in detail
V. S. Ramachandran is a neurologist at UC San Diego who investigates the mysteries of the brain through clinical cases — not through expensive brain imaging but through careful bedside experiments that are often elegantly simple and deeply revealing. Phantoms in the Brain, written with science journalist Sandra Blakeslee and published in 1998, describes the cases that Ramachandran found most illuminating, from phantom limbs to denial of paralysis to religious experience.
The opening chapters on phantom limbs are the book's best-known contribution. Amputees often feel sensations — including pain — in limbs that are no longer there. Ramachandran asked why and produced a breakthrough: the brain maps the body, but maps can be remapped. When an arm is amputated, the cortex devoted to the arm can be taken over by adjacent cortex — the face, in some cases — producing the sensation that touching the face causes feelings in the phantom arm. The mirror box treatment, which uses the reflection of the intact arm to create a visual illusion of the phantom moving, can reduce phantom pain — simple, cheap, and derived from first principles.
Beyond phantom limbs, Ramachandran covers neglect (patients who deny or ignore the left half of their world after right hemisphere strokes), anosognosia (denial of paralysis), capgras syndrome (the belief that a close relative has been replaced by an impostor), cotard's syndrome (the belief that one is dead), and the role of the temporal lobe in religious and mystical experience. Each case is a natural experiment — damage to a specific system reveals what that system normally does.
The book is written with Ramachandran's characteristic blend of scientific precision and showmanship. He is a provocateur who likes to challenge orthodoxy, and some of his speculations extend beyond what his evidence supports. But his experimental inventiveness and his gift for thinking from first principles about what brain cases reveal about mind make Phantoms in the Brain one of the most stimulating introductions to neuropsychology available to general readers.
The big ideas
- 1.
Phantom limbs demonstrate that the brain models the body rather than simply receiving signals from it. The model can persist after the physical limb is gone.
- 2.
Cortical maps are remappable. After amputation, cortex devoted to the missing limb is taken over by adjacent regions, which explains why amputees sometimes feel face-touching as phantom-limb sensation.
- 3.
The mirror box treatment for phantom limb pain — using visual feedback of the intact limb to 'move' the phantom — demonstrates that visual input can override other sensory signals and reduce pain.
