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Lookup NU author(s): Dr Malgorzata Lagisz, Kaoru Nakagawa
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© 2020 Elsevier LtdJust as happy people see the proverbial glass as half-full, ‘optimistic’ or ‘pessimistic’ responses to ambiguity might also reflect affective states in animals. Judgement bias tests, designed to measure these responses, are an increasingly popular way of assessing animal affect and there is now a substantial, but heterogeneous, literature on their use across different species, affect manipulations, and study designs. By conducting a systematic review and meta-analysis of 459 effect sizes from 71 studies of non-pharmacological affect manipulations on 22 non-human species, we show that animals in relatively better conditions, assumed to generate more positive affect, show more ‘optimistic’ judgements of ambiguity than those in relatively worse conditions. Overall effects are small when considering responses to all cues, but become more pronounced when non-ambiguous training cues are excluded from analyses or when focusing only on the most divergent responses between treatment groups. Task type (go/no-go; go/go active choice), training cue reinforcement (reward-punishment; reward-null; reward-reward) and sex of animals emerge as potential moderators of effect sizes in judgement bias tests.
Author(s): Lagisz M, Zidar J, Nakagawa S, Neville V, Sorato E, Paul ES, Bateson M, Mendl M, Lovlie H
Publication type: Review
Publication status: Published
Journal: Neuroscience and Biobehavioral Reviews
Year: 2020
Volume: 118
Pages: 3-17
Print publication date: 01/11/2020
Online publication date: 16/07/2020
Acceptance date: 14/07/2020
ISSN (print): 0149-7634
ISSN (electronic): 1873-7528
Publisher: Elsevier Ltd
URL: https://doi.org/10.1016/j.neubiorev.2020.07.012
DOI: 10.1016/j.neubiorev.2020.07.012
PubMed id: 32682742
