Decreased sexual interest.
A replication of this experiment found that rewarding children with certificates and trophies decreased intrinsic interest in playing math games.
There could be decreased interest in the Olympic ice hockey tournament, and the Sochi Olympics in general, without the participation of NHL players.
The symptoms are fatigue, emotional numbness, decreased interest and satisfaction in work and, sometimes, psychophysiological illnesses like ulcers and high blood pressure.
