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Stereotypy and perseverative responding in caged bears: further data and analyses.

Show simple item record Mason, G.J. Vickery, S.S. 2012-12-03T03:46:08Z 2012-12-03T03:46:08Z 2005
dc.description.abstract Stereotypies are common in captive animals; yet, their underlying mechanisms are poorly understood. One hypothesis [Garner, J.P., 1999. The aetiology of stereotypy in caged animals. Ph.D. Thesis. University of Oxford, UK] proposes them to be symptoms of altered behavioural organisation (behavioural disinhibition) mediated by striatal dysfunction, and thus, fundamentally analogous to the repetitive behaviours associated with human pathologies such as schizophrenia and autism, or induced in animals by stimulant drugs and striatal lesions. Consistent with this, we previously showed stereotypy frequency to be positively correlated with inappropriate responding during the extinction phase of learning, a measure of ‘perseveration’ consistent with striatal dysfunction, in caged bears [Vickery, S.S., Mason, G.J., 2003. Behavioral persistence in captive bears: implications for reintroduction. Ursus 14, 35–43]. Here, adding new data, we strengthen this finding and look for further evidence of striatal involvement. Twenty-one bears of two species (Asiatic black bears (Ursus thibetanus) and Malayan sun bears (Helarctos malayanus)) were taught a simple food rewarded spatial discrimination task. Home cage stereotypy levels ranged between 1 and 45% of all observations (S.E. = 2.75), and high and low stereotypy bears did not differ in the ease with which they learnt the task. However, when responses were no longer rewarded (i.e. food rewards were withheld), as predicted, the most stereotypic animals took the longest to extinguish responding. Contrary to some previous studies, however, further evidence of striatal involvement was limited: behavioural switching rates were not related to stereotypy frequency or to perseveration, and levels of normal activity were only weakly related to perseveration (a trend), leaving the mechanism underlying the relationship between stereotypy and perseveration in these animals unclear. Alternative non-striatal explanations include natural individual variation in habit-formation, general behavioural persistence or compulsiveness and these possibilities require further investigation. # 2005 Elsevier B.V. All rights reserved. en_US
dc.language.iso en en_US
dc.publisher Applied Animal Behaviour Science en_US
dc.subject Asiatic black bear en_US
dc.subject Malayan sun bear en_US
dc.subject perseveration en_US
dc.subject persistence en_US
dc.subject stereotypy en_US
dc.subject striatal dysfunction en_US
dc.title Stereotypy and perseverative responding in caged bears: further data and analyses. en_US
dc.type Article en_US
dc.contributor.affiliation Department of Animal and Poultry Science
dc.rights.license All items in the Atrium are protected by copyright with all rights reserved unless otherwise indicated.
dcterms.relation S. S. Vickery & G. J. Mason (2005). Stereotypy and perseverative responding in caged bears: further data and analyses. Applied Animal Behaviour Science 91: 247 – 260.

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