Now we know that when an action is followed by a good outcome (such as gaining food, or relieving pain, or just achieving a goal), certain brain circuits involved with learning release a bit of dopamine—the neurotransmitter most centrally involved in feelings of pleasure and pain. The release of dopamine feels good; we register it in our consciousness. But it’s not a passive reward that satisfies us and reduces our craving. Rather, dopamine circuits are centrally involved in wanting, as in “that felt great, I want more!” When you eat a potato chip, you get a small hit of dopamine, which is why
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