Environmental enrichment induces optimistic cognitive bias in rats

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Bestial boredom: a biological perspective on animal boredom and suggestions for its scientific investigation (2017, background): “reviewed in Farmer & Sundberg, 1986) A pessimistic-like cognitive bias has been shown in response to an absence of, or removal of, stimulating environmental enrichment in starlings (Bateson & Matheson, 2007), rats (Brydges et al., 2011)”
Defining and assessing animal pain (2014, unknown): “This technique has only been applied to animals relatively recently and involves measuring cognitive or judgement biases in the interpretation of ambiguous information (e.g. Brydges et al., 2011; Douglas et al., 2012; Harding et al., 2004; Mendl, Burman, Parker, & Paul, 2009).”
The influence of neonatal environment on piglet play behaviour and post-weaning social and cognitive development (2015, background): “It could e argued that NEP piglets may not be better at object ecognition, but merely are less neophobic due to an ptimistic cognitive bias (Douglas et al., 2012), although hey would have to show some cognitive understanding hat one object is novel.”