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Appraisal process in sheep (Ovis aries): Interactive effect of suddenness and unfamiliarity on cardiac and behavioral responses

Abstract : Appraisal theories state that an emotion results from an individual's evaluation of a stimulating event, which is based on a set of criteria. Each criterion triggers specific expressions that can be modulated by the outcome of other criteria. The authors analyzed the effects of the criteria of suddenness, unfamiliarity, and their combination on behavioral and cardiac responses in lambs (Ovis aries). Lambs were exposed to a visual stimulus that appeared either rapidly or slowly and was either unfamiliar or familiar. Suddenness induced a startle response and an increase in heart rate. Unfamiliarity induced an orientation response. The combination of suddenness and unfamiliarity enhanced both the heart rate increase and the behavioral orientation response. These results support the hypotheses of specificity and modulation of emotional expressions.
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Submitted on : Sunday, May 31, 2020 - 2:37:10 PM
Last modification on : Friday, November 26, 2021 - 6:46:04 PM

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L. Désiré, Isabelle Veissier, Gérard Despres, Eric Delval, Gilles Toporenko, et al.. Appraisal process in sheep (Ovis aries): Interactive effect of suddenness and unfamiliarity on cardiac and behavioral responses. Journal of Comparative Psychology, American Psychological Association, 2006, 120 (3), pp.280-287. ⟨hal-02669236⟩

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