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wedrifid comments on Conflicts Between Mental Subagents: Expanding Wei Dai's Master-Slave Model - Less Wrong
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Developing mastery is itself rewarding. Babies will be interested in pushing a foot pedal in their crib until they are satisfied they can predict/control the movement of a mobile above that is operated by the pedal, and will then lose interest.
Or, to put it another way, humans value dopamine (stimulation) rewards as well as serotonin (status) rewards.
(I could be wrong, but ISTR that serotonin levels change in response to social status changes in monkeys -- maybe someone can correct me if it's a different neurotransmitter.)
Seratonin is the right one (and dopamine a bit too, as can be expected by dopamine's general role as a 'reward' neurotransmitter.)