By applying electrical current to the brain, researchers reporting online on November 4 in Current Biology, have shown that they could enhance a person's mathematical performance for up to 6 months without influencing their other cognitive functions.
The researchers used a method of brain stimulation known as transcranial direct current stimulation (TDCS). TDCS is a noninvasive technique in which a weak current is applied to the brain constantly over time to enhance or reduce the activity of neurons. The technique has gotten attention in the last decade for its potential to improve various functions in people with neurological deficits, for instance in those who have suffered a stroke.
In the new study, the researchers applied TDCS specifically to the parietal lobe, a portion of the brain that is crucial for numerical understanding. The study participants had normal mathematical abilities but were asked to learn a series of artificial numbers - symbols that they had never seen before that they were told represented numbers - while they received the noninvasive brain stimulation. The researchers then tested participants' ability to automatically process the relationship of those artificial numbers to one another and to map them correctly in space using standard testing methods for numerical competence.
The results of the tests showed that the brain stimulation improved study participants' ability to learn the new numbers and that those improvements lasted 6 months post training.
Now that they know the TDCS treatment can improve number processing in people with normal mathematical ability, the researchers plan to test its use in those with severe numerical disabilities.
People with severe numerical disabilities often cannot manage basic tasks like understanding food labels or counting change in a supermarket. Poor numerical ability has also been linked to unemployment and low income, depression, low self-esteem, and other problems.
The findings may lead to treatments for the estimated twenty percent of the population with moderate to severe numerical disabilities (for example, dyscalculia) and for those who lose their skill with numbers as a result of stroke or degenerative disease, according to the researchers.
The researchers include Roi Cohen Kadosh, University of Oxford, Oxford, UK; Sonja Soskic, University College London, London, UK; Teresa Iuculano, University of Oxford, Oxford, UK, University College London, London, UK; Ryota Kanai, University College London, London, UK; and Vincent Walsh, University College London, London, UK.
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