Cognitive enrichment affects behavioural reactivity in domestic pigs

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Marine mammal cognition and captive care: A proposal for cognitive enrichment in zoos and aquariums (2013, unknown): “Pigs exposed to this challenge over a ten-week period exhibited a significant reduction in abnormal behaviour (Puppe et al. 2007).”
Environmental challenge and animal agency. (2011, background): “Pigs cognitively challenged in this way showed fewer aberrant behaviours in the home pen and less fear in a novel environment than conventionally fed pigs, indicating an improvement of their coping abilities (Puppe et al., 2007).”
A review of behavioural methods to study emotion and mood in pigs, Sus scrofa (2014, background): “Puppe et al., 2005; Taylor and Weary, 2000; Weary et al., 1998). Piglets weaned after 12 days of age had fewer high-frequency vocalisations in an OFT than older weaned piglets, but did not differ in lower-pitched grunts (Sumner et al., 2008). Piglets trained to associate different tonesequences with”