Horses’ (Equus caballus) Ability to Solve Visible but Not Invisible Displacement Tasks Is Associated With Frustration Behavior and Heart Rate.
Abstract: Many frameworks have assessed the ultimate and ontogenetic underpinnings in the development of object permanence, but less is known about whether individual characteristics, such as sex or training level, as well as proximate factors, such as arousal or emotional state, affect performance in these tasks. The current study investigated horses' performance in visible and invisible displacement tasks and assessed whether specific ontogenetic, behavioral, and physiological factors were associated with performance. The study included 39 Icelandic horses aged 2-25 years, of varying training levels. The horses were exposed to three tasks: (a) a choice test (n = 37), (b) a visible displacement task (n = 35), and (c) an invisible displacement task (n = 31). 27 horses in the choice test, and 8 horses in the visible displacement task, performed significantly better than expected by chance, while none did so in the invisible displacement task. This was also reflected in their group performance, where horses performed above chance level in the choice task and the visible displacement task only. In the invisible displacement task, the group performed significantly worse than expected by chance indicating that horses persistently chose the side where they had last seen the target. None of the individual characteristics included in the study had an effect on performance. Unsuccessful horses had higher heart rate levels, and expressed more behavior indicative of frustration, likely because of their inability to solve the task. The increased frustration/arousal could lead to a negative feedback loop, which might hamper performance in subsequent trials. Care should thus be taken in future experimental designs to closely monitor the arousal level of the tested individuals in order to safeguard comparability.
Copyright © 2021 Rørvang, Ničová, Sassner and Nawroth.
Publication Date: 2021-12-08 PubMed ID: 34955782PubMed Central: PMC8693624DOI: 10.3389/fnbeh.2021.792035Google Scholar: Lookup
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- Journal Article
Summary
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The research article investigates how a horse’s emotional state and characteristics affect its ability to perform in tasks requiring understanding of object permanence. The study reveals that horses can solve visible, but not invisible, displacement tasks, and this inability is associated with frustration behaviour and increased heart rate.
Research Objectives
- The primary objective of this research was to study how horses perform in visible and invisible displacement tasks. This implied exploring their understanding of object permanence, which is the concept that objects continue to exist even when they are not perceivable.
- Another aim was to ascertain whether individual characteristics, such as sex or training level, had any influence on their task performance.
- The study also sought to determine if proximate factors, such as arousal or emotional state, impacted the horses’ performance in these tasks.
Study Design
- The researchers included 39 Icelandic horses aged from 2 to 25 years, with varying training levels in the study.
- The horses underwent three different tasks: a choice test, a visible displacement task, and an invisible displacement task.
- In the visible displacement task, the horses were expected to remember the location of an object even after it got visually displaced. In the invisible displacement task, the object was hidden, and horses were left to guess its location.
Results
- The results showed that several horses performed significantly better than expected in the choice test and the visible displacement task but none in the invisible displacement task.
- The results suggested persistent behaviour in horses where they chose the side they last saw the target during the invisible displacement task, indicating a lack of understanding of object permanence in these contexts.
- Individual characteristics, such as sex or training level, had no effect on performance.
- However, horses that couldn’t solve the tasks had higher heart rates and exhibited increased frustration behaviour.
- The researchers suggested that high frustration or arousal could lead to a negative feedback loop, which might affect performance in subsequent trials.
Implications of the Study
- This study underscores the importance of monitoring emotional state and arousal levels in future experimental designs involving animals to ensure comparability.
- Understanding the limitations of horses in comprehending invisible displacements can inform better training techniques and protocols in the future.
Cite This Article
APA
Rørvang MV, Ničová K, Sassner H, Nawroth C.
(2021).
Horses’ (Equus caballus) Ability to Solve Visible but Not Invisible Displacement Tasks Is Associated With Frustration Behavior and Heart Rate.
Front Behav Neurosci, 15, 792035.
https://doi.org/10.3389/fnbeh.2021.792035 Publication
Researcher Affiliations
- Department of Biosystems and Technology, Swedish University of Agricultural Sciences, Alnarp, Sweden.
- Department of Ethology, Institute of Animal Science, Prague, Czechia.
- Department of Ethology and Companion Animal Science, Czech University of Life Sciences in Prague, Prague, Czechia.
- Department of Biosystems and Technology, Swedish University of Agricultural Sciences, Alnarp, Sweden.
- Research Institute for Farm Animal Biology (FBN), Institute of Behavioural Physiology, Dummerstorf, Germany.
Conflict of Interest Statement
The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
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