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Researchers analyse the role serotonin plays in reward and learning.
And then, something happened which the team had not been expecting: right after the rules were changed, there was a second serotonin spike. According to the authors, this increase in the neurons’ activity is exclusively due to the “surprise effect” brought about by the sudden reversal of the environmental conditions with which the mice are familiar – and not to any prediction of the outcome. NeuroscienceNews image is for illustrative purposes only.