Some habits die hard. Like humans zapping their brains. We did this back in Ancient Greece, when medics used electric fish to treat headaches and other ailments. Today we’re still at it, as neuroscientists apply electric currents to people’s brains to boost their mental function, treat depression, or give them lucid dreams. Subjecting the brain to external electricity has an influence on mental function because our neurons communicate with each other using electricity and chemicals. This has become relatively common knowledge today, but only two centuries ago scientists were still quite baffled by the mystery of nerve communication. Issac Newton and others suggested that our nerves communicate with each other, and with the muscles, via vibrations. Another suggestion of the time was that the nerves emit some kind of fluid. Most opaque, and still popular, was the idea – first mooted in ancient times – that the brain and nerves are filled with mysterious “animal spirits”. More via WIRED.
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