There's this idea called the hedonic treadmill, which I think some people have said have been has been discredited. But it does seem compatible with the whole predictive modeling view of what the brain is doing. Can happiness be understood as noticing that our prediction was a little pessimistic and things are actually a little bit better? That sounds like a great account of why we think there's an arrow of time. We feel it, right? Why that's part of our image of the world.

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