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Another interesting article. It is ALL in the brain.
Wed Nov 15, 2017 8:22am


Few people have followed the emergence of acquired savants with more interest than Allan Snyder, a neuroscientist at the University of Sydney in Australia. Since 1999, Snyder has focused his research on studying how their brains function. He's also pressed further into speculative territory than most neuroscientists feel comfortable: He is attempting to produce the same outstanding abilities in people with undamaged brains.

Last spring, Snyder published what many consider to be his most substantive work. He and his colleagues gave 28 volunteers a geometric puzzle that has stumped laboratory subjects for more than 50 years. The challenge: Connect nine dots, arrayed in three rows of three, using four straight lines without retracing a line or lifting the pen. None of the subjects could solve the problem. Then Snyder and his colleagues used a technique called transcranial direct current stimulation (tDCS) to temporarily immobilize the same area of the brain destroyed by dementia in Miller's acquired savants. The noninvasive technique, which is commonly used to evaluate brain damage in stroke patients, delivers a weak electrical current to the scalp through electrodes, depolarizing or hyperpolarizing neural circuits until they have slowed to a crawl. After tDCS, more than 40 percent of the participants in Snyder's experiment solved the problem. (None of those in a control group given placebo tDCS identified the solution.)

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