Rewards and dopamine
Our brains compute 3 things about reward: how much will we get, how soon will we get it, and how certain are we that we will in fact get it.
And it’s when the probability of a reward hovers at around 50% that dopamine flow is maximal. When the probability of getting it is as high as the probability of not getting it — the point of maximum uncertainty. That’s what turns us on the most.
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