1 The Open Access Advantage for Studies of Human Electrophysiology: Impact on Citations and Altmetrics Peter E. Clayson*1, Scott A. Baldwin2, and Michael J. Larson2,3 1Department of Psychology, University of South Florida, Tampa, FL 2Department of Psychology, Brigham Young University, Provo, UT 3Neuroscience Center, Brigham Young University, Provo, UT *Corresponding author at: Department of Psychology, University of South Florida, 4202 East Fowler Avenue, Tampa, FL, US, 33620-7200. Email:
[email protected] 2 Disclosure Michael J. Larson, PhD, is the Editor-in-Chief of the International Journal of Psychophysiology. Editing of the manuscript was handled by a separate editor and Dr. Larson was blinded from viewing the reviews or comments as well as the identities of the reviewers. 3 Abstract Barriers to accessing scientific findings contribute to knowledge inequalities based on financial resources and decrease the transparency and rigor of scientific research. Recent initiatives aim to improve access to research as well as methodological rigor via transparency and openness. We sought to determine the impact of such initiatives on open access publishing in the sub-area of human electrophysiology and the impact of open access on the attention articles received in the scholarly literature and other outlets. Data for 35,144 articles across 967 journals from the last 20 years were examined. Approximately 35% of articles were open access, and the rate of publication of open-access articles increased over time. Open access articles showed 9 to 21% more PubMed and CrossRef citations and 39% more Altmetric mentions than closed access articles. Green open access articles (i.e., author archived) did not differ from non-green open access articles (i.e., publisher archived) with respect to citations and were related to higher Altmetric mentions.