AUTHOR=Viola Marco TITLE=Commentary: Constructing nonhuman animal emotion JOURNAL=Frontiers in Psychology VOLUME=8 YEAR=2017 URL=https://www.frontiersin.org/journals/psychology/articles/10.3389/fpsyg.2017.02070 DOI=10.3389/fpsyg.2017.02070 ISSN=1664-1078