[4241] Festini, S. B., McDonough I. M., & Park D. C. (2016).  The Busier the Better: Greater Busyness Is Associated with Better Cognition. Frontiers in Aging Neuroscience. 8,

[4057] McDonough, I. M., Haber S., Bischof G. N., & Park D. C. (2015).  The Synapse Project: Engagement in mentally challenging activities enhances neural efficiency. Restorative Neurology and Neuroscience. 33(6), 865 - 882.