The Willpower Instinct: How Self-Control Works, Why It Matters, and What You Can Do To Get More of It

by Kelly McGonigal

Studies show that you can annihilate the entire dopamine system in a rat’s brain, and it will still get a goofy grin on its face if you feed it sugar. What it won’t do is work for the treat. It likes the sugar; it just doesn’t want it before it has it.

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