Serotonin modulated learning by influencing plasticity
Serotonin might be involved in learning - short science articles

Researchers have shown that serotonin which is one of the most widely available chemicals in the brain might be involved in learning. They used the optogenetic technique in which one can modulate neuron firing using light and found that the learning rate in mice was modulated by serotonin stimulation. Mice normally use a win-stay, lose-switch strategy in which they repeated a choice which was rewards but shifted if that choice wasn't rewarded. However, serotonin accentuated a long-term strategy in which they made decisions based on a long history of rewards. Scientists suggest that serotonin boosted plasticity by influencing rate of learning.

Read the full story: UCL
Scientific publication: Nature Communications