AUTHOR=van Erp Jan B. F. , Brouwer Anne-Marie , Zander Thorsten O. TITLE=Editorial: Using neurophysiological signals that reflect cognitive or affective state JOURNAL=Frontiers in Neuroscience VOLUME=9 YEAR=2015 URL=https://www.frontiersin.org/journals/neuroscience/articles/10.3389/fnins.2015.00193 DOI=10.3389/fnins.2015.00193 ISSN=1662-453X