Dopamine isn’t used only for reward signaling. It is also used for aversion. “Yum, let’s get more of that!” and “Ick, let’s stay away from that!” are *both* incentive-driven thoughts.
And it’s also used for other things, too. Parkinson’s disease is treated with drugs that activate dopamine receptors, but L-Dopa isn’t an addictive drug.
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