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Impaired instrumental choice in crib-biting horses (Equus caballus)

Authors
Journal
Behavioural Brain Research
0166-4328
Publisher
Elsevier
Publication Date
Volume
191
Issue
1
Identifiers
DOI: 10.1016/j.bbr.2008.03.009
Keywords
  • Horse
  • Stereotypy
  • Striatum
  • Dopamine
  • Concurrent-Chain Schedules
  • Choice

Abstract

Abstract Horses displaying an oral stereotypy were tested on an instrumental choice paradigm to examine differences in learning from non-stereotypic counterparts. Stereotypic horses are known to have dysfunction of the dorsomedial striatum, and lesion studies have shown that this region may mediate response-outcome learning. The paradigm was specifically applied in order to examine learning that requires maintenance of response–outcome judgements. The non-stereotypic horses learned, over three sessions, to choose a more immediate reinforcer, whereas the stereotypic horses failed to do so. This suggests an initial behavioural correlate for dorsomedial striatum dysregulation in the stereotypy phenotype.

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