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Review
. 2023 Aug 4:10:1242906.
doi: 10.3389/fvets.2023.1242906. eCollection 2023.

Knowledge of lateralized brain function can contribute to animal welfare

Lesley J Rogers  1
Affiliations
Review

Knowledge of lateralized brain function can contribute to animal welfare

Lesley J Rogers. Front Vet Sci. .

Abstract

The specialized functions of each hemisphere of the vertebrate brain are summarized together with the current evidence of lateralized behavior in farm and companion animals, as shown by the eye or ear used to attend and respond to stimuli. Forelimb preference is another manifestation of hemispheric lateralization, as shown by differences in behavior between left- and right-handed primates, left- and right-pawed dogs and cats, and left- and right-limb-preferring horses. Left-limb preference reflects right hemisphere use and is associated with negative cognitive bias. Positive cognitive bias is associated with right-limb and left-hemisphere preferences. The strength of lateralization is also associated with behavior. Animals with weak lateralization of the brain are unable to attend to more than one task at a time, and they are more easily stressed than animals with strong lateralization. This difference is also found in domesticated species with strong vs. weak limb preferences. Individuals with left-limb or ambilateral preference have a bias to express functions of the right hemisphere, heightened fear and aggression, and greater susceptibility to stress. Recognition of lateralized behavior can lead to improved welfare by detecting those animals most likely to suffer fear and distress and by indicating housing conditions and handling procedures that cause stress.

Keywords: cognitive bias; companion animals; farm animals; fear; hemispheric asymmetry; limb preference; stress; welfare.

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Conflict of interest statement

The author declares that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Figures

Figure 1
Figure 1
This figure presents a summary of the functions of the left and right hemispheres, as reported in a range of species.
See this image and copyright information in PMC

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