Zebunke, M., Puppe, B., Langbein, J. 2013. Effects of cognitive enrichment on behavioural and physiological reactions of pigs. Physiology & Behavior 118, 70-79.
Cognitive enrichment, a special form of environmental enrichment, addresses the cognitive abilities of animals in captivity. Through cognitive interaction with the environment, the animals regain a certain control over their environment, and essential resources, such...