AUTHOR=Yuan Ti-Fei , Su Huanxing TITLE=Fear learning through the two visual systems, a commentary on: “A parvalbumin-positive excitatory visual pathway to trigger fear responses in mice” JOURNAL=Frontiers in Neural Circuits VOLUME=9 YEAR=2015 URL=https://www.frontiersin.org/journals/neural-circuits/articles/10.3389/fncir.2015.00056 DOI=10.3389/fncir.2015.00056 ISSN=1662-5110