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Models of motivational decision-making and how they affect the experimental assessment of motivational priorities

Published online by Cambridge University Press:  27 February 2018

G. Mason ,
J. Cooper  and
J. Garner
G. Mason
Affiliation:
Animal Behaviour Research Group, Department of Zoology, University of Oxford, South Parks Road, Oxford OX1 3PS
J. Cooper
Affiliation:
Animal Behaviour Research Group, Department of Zoology, University of Oxford, South Parks Road, Oxford OX1 3PS
J. Garner
Affiliation:
Animal Behaviour Research Group, Department of Zoology, University of Oxford, South Parks Road, Oxford OX1 3PS
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Abstract

Measuring motivation has recently become a key issue in animal welfare, yet it can be difficult to implement in practice and even more difficult to apply validly to the specific animals whose welfare it is hoped to improve. Ethologists have modelled motivation in a number of ways. Here, we review these models (along with consumer demand approaches) to identify some of the factors that need to be controlled to conduct experiments with maximum internal and external validity. They indicate that to conduct experiments that make valid assessments of animals’ priorities, bouts of behaviour should not be curtailed, measurements should not be restricted to only one period or context and subjects should be kept in closed economies; time spent with resource should not be used as the only measure of consumption, as rate can vary with motivation and if demand curves are desired, the cost paid and amount of opportunity ‘bought’ must co-vary. Having avoided these pitfalls, further factors must be taken into account to ensure external validity. Animals’ priorities are affected by many aspects of their internal state and external environment, including the presence of eliciting stimuli, the number of behavioural opportunities available and the size of their time and energy budgets. A well fed animal in an enriched enclosure with excess energy but only limited time to allocate to many different activities would thus be likely to have quite different priorities from an under-fed animal with excess time available, housed in a barren environment. Hence studies of the former could not validly be applied to improve the welfare of the latter.

Type
Research Article
Information
BSAP Occasional Publication , Volume 20: Animal Choices , 1997 , pp. 9 - 17
Copyright
Copyright © The British Society of Animal Science 1997

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