We describe a protocol for inducing rewarding and nonrewarding experiences in fruit flies (Drosophila melanogaster) using voluntary ethanol consumption as a measure for changes in reward states.
Zer, S., Ryvkin, J., Wilner, H. J., Zak, H., Shmueli, A., Shohat-Ophir, G. A Simple Way to Measure Alterations in Reward-seeking Behavior Using Drosophila melanogaster. J. Vis. Exp. (118), e54910, doi:10.3791/54910 (2016).