The assumption that an ambiguous stimulus contains a reward despite the lack of evidence is called an optimism bias. Perry's experiment suggests that a bit of sugar amped up the bees into a positive emotional state, making them more optimistic that the flower would contain a sugary treat.
Sound familiar? Something similar is true in humans—newborn infants cry less if they've been offered a sweet snack, and a bit of candy increases feelings of positivity and improves bad moods in adults, too. “Many of us view the world in a better way when we have a nice piece of dark chocolate,” Perry says.
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