AUTHOR=Barnhill Eric TITLE=Entrainment is sparse JOURNAL=Frontiers in Human Neuroscience VOLUME=8 YEAR=2014 URL=https://www.frontiersin.org/journals/human-neuroscience/articles/10.3389/fnhum.2014.00618 DOI=10.3389/fnhum.2014.00618 ISSN=1662-5161