Stereotypic head twirls, but not pacing, are related to a ‘pessimistic’-like judgment bias among captive tufted capuchins (Cebus apella)

The effect of a randomised enrichment treatment schedule on the behaviour of cheetahs (Acinonyx jubatus)

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Species-specific patterns in fecal glucocorticoid and androgen levels in zoo-living orangutans (Pongo spp.)

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Environmental enrichment induces optimistic cognitive bias in rats

(2010) Nichola M. Brydges et al.   ANIMAL BEHAVIOUR

Stereotyping starlings are more ‘pessimistic’

(2010) Ben O. Brilot et al.   ANIMAL COGNITION

Cognitive bias in the chick anxiety–depression model

(2010) Amy L. Salmeto et al.   BRAIN RESEARCH

Naloxone decreases the inhibitory effect of alprazolam on the release of adrenocorticotropin/cortisol induced by physical exercise in man

(2010) Vittorio Coiro et al.   BRITISH JOURNAL OF CLINICAL PHARMACOLOGY

Dogs showing separation-related behaviour exhibit a ‘pessimistic’ cognitive bias

(2010) Michael Mendl et al.   CURRENT BIOLOGY

An integrative and functional framework for the study of animal emotion and mood

(2010) M. Mendl et al.   PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES

Effects of positive reinforcement training techniques on the psychological welfare of zoo-housed chimpanzees (Pan troglodytes)

(2009) Ori Pomerantz et al.   AMERICAN JOURNAL OF PRIMATOLOGY

Cognitive bias as an indicator of animal emotion and welfare: Emerging evidence and underlying mechanisms

(2009) Michael Mendl et al.   APPLIED ANIMAL BEHAVIOUR SCIENCE

A common neurobiology for pain and pleasure

(2008) Siri Leknes et al.   NATURE REVIEWS NEUROSCIENCE

Larger, enriched cages are associated with ‘optimistic’ response biases in captive European starlings (Sturnus vulgaris)

(2007) Stephanie M. Matheson et al.   APPLIED ANIMAL BEHAVIOUR SCIENCE