Summary
Electromedicine pioneers have known this for years. Now it's finally being explored by more conventional scientists, and the results are exciting: a 20% boost in verbal skills from the application of a tiny electric current.
Original source:
http://www.nature.com/news/2004/041025/full/041025-9.html
Details
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Connecting a battery across the front of the head can boost verbal skills, says a team from the US National Institutes of Health.
- A current of two thousandths of an ampere (a fraction of that needed to power a digital watch) applied for 20 minutes is enough to produce a significant improvement, according to data presented this week at the annual meeting of the Society for Neuroscience, held in San Diego.
- Meenakshi Iyer of the National Institute of Neurological Disorders and Stroke in Bethesda, Maryland, ran the current through 103 initially nervous volunteers.
- Given around 90 seconds, most people get around 20 words.
- But when Iyer administered the current, her volunteers were able to name around 20% more words than controls, who had the electrodes attached but no current delivered.
- Iyer says more work needs to be done to explain the effect, but she speculates that the current changes the electrical properties of brain cells in the prefrontal cortex, the brain region through which it passes.
- Iyer's group, which is led by Eric Wassermann, was prompted to run the tests after considering problems facing researchers who were studying the effect of magnetic fields on the brain.
- Some neuroscientists hope that magnetic fields could have a therapeutic effect, perhaps by boosting activity in areas of the brain that have suffered cell loss owing to dementia.
- The idea of using electrical current to boost brain activity dates back to experiments on animals in the 1950s.
- The early work showed some potential, but fell from favour because of a perceived link to electroconvulsive therapy, a controversial technique in which patients with depression are treated by having short but intense pulses of electricity applied to the brain.
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