Randolph M. Nesse:
"When times are good and likely to stay that way, there is no need for exuberant effort now. If mastodons come by every day, seeing a herd is no reason to get excited. If your crop can be harvested anytime, relax. But if mastodon sightings are rare, intense effort now will be worth it. It seems paradoxical, but intense high mood is mainly valuable for short-lived opportunities. Low mood is more useful for temporary unpropitious situations than indefinite bad time."
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"I got excited.":
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Randolph M. Nesse:
"Individuals whose mood rises in propitious situations can take full advantage of opportunities. Individuals whose mood goes down in unpropitious situations can avoid risks and wasted effort and can shift to different strategies or different goals. The capacity to vary mood with changes to propitiousness gives a selective advantage."
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