Social activity and cognitive functioning over time: A coordinated analysis of four longitudinal studies

Cassandra L. Brown, Laura E. Gibbons, Robert F. Kennison, Annie Robitaille, Magnus Lindwall, Meghan B. Mitchell, Steven D. Shirk, Alireza Atri, Cynthia R. Cimino, Andreana Benitez, Stuart W S MacDonald, Elizabeth M. Zelinski, Sherry L. Willis, K. Warner Schaie, Boo Johansson, Roger A. Dixon, Dan M Mungas, Scott M. Hofer, Andrea M. Piccinin