Rewards you with large amounts of dopamine. This dopamine trains your brain pathways to be rewarded with those activities regardless of how they are are. This means if you pick your fingers you will train your brain to reward dopamine to the pain of picking your fingers. If you are doing homework your brain will be getting dopamine so it won’t want you to get up and move around in search of more dopamine. You get an endless supply of dopamine to endlessly reward yourself for doing much of nothing.
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