Robert Cooper, author of The Other 90%, says that we shouldn’t think of intelligence as happening only in the brain in our skulls. He talks of the “heart” brain and the “gut” brain. Whenever we have a direct experience, he says, it does not go directly to the brain in our heads. The first place it goes is to the neurological networks of the intestinal tract and heart. He describes the first of these, the enteric nervous system, as a “second brain” inside the intestines, which is “independent of but also interconnected with the brain in the cranium.” He says that this is why we often experience
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