In his book Incognito, neuroscientist David Eagleman describes the brain as a “team of rivals.” He writes, “There is an ongoing conversation among the different factions in your brain, each competing to control the single output channel of your behavior.” He lays out the dominant two-party system of reason and emotion: “The rational system is the one that cares about analysis of things in the outside world, while the emotional system monitors the internal state and worries whether things are good or bad.” Eagleman makes the case that because both parties are battling to control one
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