A University of Toronto report based on two neural imaging studies that monitored brain activity has found a reward given for telling the truth gives people greater satisfaction than the same reward given for deceit.
MORE: http://www.sciencedaily.com/releases/2014/01/140123154754.htm
See also...
Telling the whole truth may ease feelings of guilt
http://www.sciencedaily.com/releases/2014/01/140123075711.htm
