1. Department
of Cognitive Sciences, École Normale Supérieure, Paris 75005, France
2. Targacept Inc., Winston-Salem, North Carolina 27101, United States
3. Wake Forest School of Medicine, Winston-Salem, North Carolina 27157, United States
4. St. Petersburg State University, St. Petersburg 199034, Russia
5. Center
for Cognition and Decision Making, National Research University Higher School of Economics, Moscow 101000, Russia