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Lateralization01:28

Lateralization

Brain lateralization refers to the division of mental processes and functions between the two hemispheres of the brain, a phenomenon that optimizes neural efficiency and underpins complex abilities in humans. This specialization allows each hemisphere to perform tasks where it has a comparative advantage, facilitating more refined cognitive capabilities across different domains.
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Related Experiment Video

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Clinical Examination Protocol to Detect Atypical and Classical Scrapie in Sheep
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Behavioural lateralization in sheep (Ovis aries).

Elisabetta Versace1, Massimo Morgante, Giuseppe Pulina

  • 1Department of Psychology and B.R.A.I.N. Centre for Neuroscience, University of Trieste, Via S. Anastasio 12, 34123 Trieste, Italy.

Behavioural Brain Research
|August 3, 2007
PubMed
Summary

Sheep and lambs show right-side bias when avoiding obstacles, with lambs exhibiting stronger lateralization. Different tasks reveal both individual and population-level behavioral lateralization in sheep.

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Last Updated: Jul 13, 2026

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Published on: January 19, 2014

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Area of Science:

  • Ethology
  • Animal Behavior
  • Neuroscience

Background:

  • Behavioral lateralization, or the preferential use of one side of the body, is common in animals.
  • Understanding lateralization in livestock like sheep can provide insights into social behavior and cognition.

Purpose of the Study:

  • To investigate behavioral lateralization in sheep and lambs across different age groups and tasks.
  • To explore potential links between observed lateralization and social factors.

Main Methods:

  • A flock of sheep and lambs was observed avoiding an obstacle, with their turning direction recorded.
  • Adult sheep were also tested for preferential foreleg use and jaw movement direction during rumination.

Main Results:

  • A population-level right-side bias was observed in obstacle avoidance, more pronounced in lambs than adult sheep.
  • No population bias in foreleg use was found, but individual-level lateralization was noted in rumination jaw movements.
  • Lambs showed greater lateralization in obstacle avoidance, possibly linked to social stimuli.

Conclusions:

  • Behavioral lateralization in sheep varies depending on the task and age.
  • Individual and population-level asymmetries can coexist within the same species.
  • Population-level biases may be more prevalent in tasks involving social coordination.