Stimulating the brain with electricity improves working memory, mental maths, focused attention, creativity and could help treat depression. You can even buy DIY kits online. That’s the good news. The bad news is that the most recent investigation has found it has almost no measurable effect on the brain. It’s a conclusion that is likely to be controversial. Over the past decade, thousands of studies have reported a beneficial effect of transcranial direct current stimulation (tDCS) on the brain, as well as on behaviour and cognition – so much so that it has become something of a hot topic in neuroscience.
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