I generally think that passions are driven by incentives at a much more primitive or developmentally early level. This is inspired by the research on savant talents; children with "savant syndrome" seem to be born talented but actually their talents evolve with practice.
(Of course, dispositions can also be *consciously* changed in adulthood; Stevenson intentionally lived a strenuous, adventurous life and cultivated physical courage.)
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Feedback on "inclusive-fitness" stuff (survival, reproduction, etc) is slower to arrive than the (probably dopaminergic) feedback loop involved in learning/skill-building (particularly motor) which makes "getting it right" feel directly rewarding.
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Maybe you use (less precise) guesses/heuristics/priors about the big inclusive-fitness stuff to govern whether you turn on the rapid, precise "obsession/hyperfocus/motor-learning-like" feedback loop used for skill-building?
End of conversation
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