21 Jan '15, 7pm

Brain Hackers Beware: Scientist Says tDCS Has No Effect

Illustration: Randi Klett; Man: Getty Images The largest meta-analysis yet of the ability of one kind of electrical brain stimulation technology to alter how people think and feel has found no evidence that it has any effect on healthy adults. Jared Horvath, a neuroscientist at the University of Melbourne, in Australia, looked at every study of transcranial direct current stimulation (tDCS ) that reported an impact on cognitive and behavioral activities such as problem solving, learning, mental arithmetic, vision tasks, and memory games. He then excluded results that had not been replicated by other researchers, as well as any experiments lacking a “sham condition” control group—where participants were connected to the device but didn’t receive current. While many of the more than 200 individual studies that remained claimed to have found significant effects, those effects...

Full article: http://spectrum.ieee.org/biomedical/ethics/brain-hackers-...

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