Back in 1939 neuroscientists developed a technique to treat severe epileptic seizures by cutting the central connective tissue between the two hemispheres of the brain in two. This surprisingly simple technique effectively stopped the seizures, but that was hardly the most interesting thing about their findings. Researchers soon discovered that it was possible to design careful experiments that would allow them to communicate with each hemisphere of the brain independently.  Neuroscience would never be the same again. 

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