By Abigail Zuger, M.D., The New York Times, May 29, 2007
…In classical neuroscience, the adult brain was considered an immutable machine, as wonderfully precise as a clock in a locked case. Every part had a specific purpose, none could be replaced or repaired, and the machine was destined to tick in unchanging rhythm until its gears corroded with age.
Now sophisticated experimental techniques suggest the brain is more like a Disney-esque animated sea creature. Constantly oozing in various directions, it is apparently able to respond to injury with striking functional reorganization, and can at times actually think itself into a new anatomic configuration, in a kind of word-made-flesh outcome far more characteristic of Lourdes than the National Institutes of Health.
So it is forgivable that Dr. Doidge, a Canadian psychiatrist and award-winning science writer, recounts the accomplishments of the “neuroplasticians,” as he calls the neuroscientists involved in these new studies, with breathless reverence. Their work is indeed mind-bending, miracle-making, reality-busting stuff, with implications, as Dr. Doidge notes, not only for individual patients with neurologic disease but for all human beings, not to mention human culture, human learning and human history.
And all this from the fact that the electronic circuits in a small lump of grayish tissue are perfectly accessible, it turns out, to any passing handyman with the right tools.
For patients with brain injury, the revolution brings only good news, as Dr. Doidge describes in numerous examples. A woman with damage to the inner ear’s vestibular system, where the sense of balance resides, feels as if she is in constant free fall, tumbling through space like an ocean bather pulled under by the surf. Sitting in a neuroscience lab, she puts a set of electrodes on the surface of her tongue, a wired-up hard hat on her head, and the feel of falling stops. The apparatus connects to a computer to create an external vestibular system, replacing her damaged one by sending the proper signals to her brain via her tongue.
But that’s not all. After a year of sessions with the device, she no longer needs it: her brain has rewired itself to bypass the damaged vestibular system with a new circuit….