People who struggle with basic arithmetic may get a boost from a tool that electrically stimulates the brain, according to a study that appeared November 23 in Current Biology.
Researchers at the University of Oxford and University College London studied people with normal math skills using a noninvasive technique called transcranial direct-current stimulation, in which scalp electrodes emit current that modulates neural activity. The team focused on the right parietal cortex because it contributes to spatial and mathematical thinking. This brain region shows abnormal responses in children with developmental dyscalculia, a learning disability that affects math skills.
Over the span of six days the investigators applied current over the volunteers’ right parietal lobe for 20 minutes at the beginning of training sessions in which subjects learned to associate numbers with arbitrary symbols, such as triangles or cylinders. After practicing, subjects were rapidly presented with pairs of symbols of different visual sizes (using larger or smaller fonts), and they had to choose the physically larger one as quickly as they could. In some of the pairs, the physically larger item represented a smaller magnitude—for instance, a huge symbol meaning “two” was paired with a tiny symbol representing “five”—and that mismatch could cause a delay in reaction time because subjects must override their impulse to choose the greater number.
By the fourth day subjects who had their right parietal cortex stimulated became slower for mismatched trials as compared with matched trials, just as adults are when they respond to real digits. But participants who did not receive the same pattern of stimulation showed no difference between these trials, suggesting they had not internalized the symbols’ meaning. The results indicate that right-hemisphere stimulation helps people learn numerical symbols.
The superior performance lasted for six months—a long effect that suggests the method may someday benefit those with developmental dyscalculia, says study co-author Roi Cohen Kadosh, a cognitive neuroscientist at Oxford. “This was the first step in finding a way to improve numerical abilities,” he says.
This article was originally published with the title A Stimulating Solution for Math Problems.
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4 Comments
Add CommentReminds me of a scene in the 1984 movie, "The Adventures of Buckaroo Banzai Across the 8th Dimension", where the mad scientist, Dr. Emilio Lizardo, places a electrode clasp on his tongue in order to recall past extradimensional experiences - yippee!
Reply | Report Abuse | Link to thisHow much voltage is used , AC or DC?
Reply | Report Abuse | Link to thisWhere do I hook my skin up?
This research finding using tDCS stimulation to "prime" math is on the same pathway as the priming of one hemisphere by squeezing a ball with one hand. That study from the Brain Research Center of Bar-Ilan University, Israel (Psychonomic Bulletin & Review) targeted the priming of creativity by squeezing a ball and activating the opposite hemisphere. Roger at mindRAMP.org
Reply | Report Abuse | Link to thisECT was never that useful for learning and nobody who has been zapped on an electric chair has really ever shone when the current went down, so I suppose from the Homeopathic perspective a little bit of DC current is bound to be good for you. It would be interesting to see whether it can be replicated by a researcher who has never had their brain fried.
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