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Development of a standard test to assess negative reinforcement learning in horses

Research output: Contribution to journalArticle

  • Line Peerstrup Ahrendt
  • Rodrigo Labouriau
  • Jens Malmkvist
  • Christine J. Nicol
  • Janne Winther Christensen
Original languageEnglish
Pages (from-to)38-42
Number of pages5
JournalApplied Animal Behaviour Science
DatePublished - 1 Aug 2015


Most horses are trained by negative reinforcement. Currently, however, no standardised test for evaluating horses' negative reinforcement learning ability is available. The aim of this study was to develop an objective test to investigate negative reinforcement learning in horses. Twenty-four Icelandic horses (3 years old) were included in this study. The horses were tested in a pressure-release task on three separate days with 10, 7 and 5 trials on each side, respectively. Each trial consisted of pressure being applied on the hindquarter with an algometer. The force of the pressure was increased until the horse moved laterally away from the point of pressure. There was a significant decrease in required force over trials on the first test day (P < 0.001), but not the second and third day. The intercepts on days 2 and 3 differed significantly from day 1 (P < 0.001), but not each other. Significantly stronger force was required on the right side compared to the left (P < 0.001), but there was no difference between first and second side tested (P=. 0.56). Individual performance was evaluated by median-force and the change in force over trials on the first test day. These two measures may explain different characteristics of negative reinforcement learning. In conclusion, this study presents a novel, standardised test for evaluating negative reinforcement learning ability in horses.

    Research areas

  • Algometry, Horse behaviour, Horse training, Learning performance, Operant conditioning, Pressure-release


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