AUTHOR=Rockland Kathleen S. TITLE=Notes on Visual Cortical Feedback and Feedforward Connections JOURNAL=Frontiers in Systems Neuroscience VOLUME=16 YEAR=2022 URL=https://www.frontiersin.org/journals/systems-neuroscience/articles/10.3389/fnsys.2022.784310 DOI=10.3389/fnsys.2022.784310 ISSN=1662-5137