Anticipation of reward in a nonaversive differential conditioning paradigm and the brain reward system: an event-related fMRI study.
Journal article published in 2003 by
P. Kirsch 
,
A. Schienle,
R. Stark,
G. Sammer,
C. Blecker,
B. Walter,
U. Ott,
J. Burkart,
D. Vaitl
,
A. Schienle,
R. Stark,
G. Sammer,
C. Blecker,
B. Walter,
U. Ott,
J. Burkart,
D. Vaitl
