AUTHOR=van Staaden Moira , Huber Robert TITLE=Editorial: Invertebrate Models of Natural and Drug-Sensitive Reward JOURNAL=Frontiers in Physiology VOLUME=10 YEAR=2019 URL=https://www.frontiersin.org/journals/physiology/articles/10.3389/fphys.2019.00490 DOI=10.3389/fphys.2019.00490 ISSN=1664-042X