There is some fascinating new research on how two brains interact—actually change—when collaborating with one another. In one set of work, scientists have found that when two people cooperate on a task (such as when a pilot and co-pilot land a plane together) their neural oscillations (electrical frequencies) align. Other researchers have found that when two birds sing a duet, the brain inhibits one from talking over the other. These types of studies have interesting implications for the understanding of consciousness.

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