positive regret

Positive regret is when we feel less happy about a positive outcome becasue we think we could have made it better. Normally we think of regret as applying to negative experiences, but we also experience the "grass is greener on the oter side" sense of posituve regret. Positive regret can help tune the exploration-exploitation trade-off, for example, if you always eat ham sandwiches for lunch and then notice someone woth a tasty lookin tuna salad – the hamd sandwich objectvely tastes as good, but dons;t feel sp encourgaing you to maybe try other chocies. In experiments with a computational model of regret, this poostuve version was as important in tunin training as its more common negative version.