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The Consciousness of a Split Brain
In the 50s and 60s, when people had severe epilepsy, there weren't that many options to treat it. A radical option was this kind of surgery called a callosotomy. It is basically cutting this big bundle of connections that connect the two brain hemispheres. These days, one of the side effects of better medical treatments for epilepsy is that these operations aren't done so much. And you have this uncanny sense that the left hemisphere is just unaware of what the other half of the brain is doing. This provokes our assumptions about what we are.