Iigaya, K., Fonseca, M. S., Murakami, M., Mainen, Z. F., & Dayan, P. (2017). The long and the short of serotonergic stimulation: Optogenetic activation of dorsal raphe serotonergic neurons changes the learning rate for rewards. BioRxiv, 215400. doi:10.1101/215400.