[1] Univ Pittsburgh, Dept Psychol, Pittsburgh, PA 15260 USA
[2] Univ Pittsburgh, Ctr Neural Basis Cognit, Pittsburgh, PA 15260 USA
[3] Univ Illinois, Dept Psychol, Urbana, IL 61801 USA
[4] Univ Illinois, Beckman Inst Adv Sci & Technol, Urbana, IL 61801 USA
[5] Ohio State Univ, Dept Psychol, Columbus, OH 43210 USA
[6] Univ Illinois, Dept Kinesiol & Community Hlth, Urbana, IL 61801 USA