Baker, K. C., Bloomsmith, M. A., Neu, K. et al. 2010. Positive reinforcement training as enrichment for singly housed rhesus macaques (Macaca mulatta). Animal Welfare 19(3), 307-313.
Positive reinforcement training is one component of behavioural management employed to improve psychological well-being. There has been regulatory promotion to compensate for restricted social housing in part by providing human interaction to singly caged primates...