Olfactory lateralization in non-human mammals: a mini-review

  • Ekaterina Berezina Department of Vertebrate Zoology, Faculty of Biology, Saint Petersburg State University, Universitetskaya nab., 7–9, Saint Petersburg, 199034, Russian Federation https://orcid.org/0000-0002-1792-6876
  • Andrey Giljov Department of Vertebrate Zoology, Faculty of Biology, Saint Petersburg State University, Universitetskaya nab., 7–9, Saint Petersburg, 199034, Russian Federation https://orcid.org/0000-0002-7533-1600
  • Karina Karenina Department of Vertebrate Zoology, Faculty of Biology, Saint Petersburg State University, Universitetskaya nab., 7–9, Saint Petersburg, 199034, Russian Federation https://orcid.org/0000-0001-8200-6876

Abstract

The asymmetric use of nostrils and few contralateral projections in olfactory neural pathways allow us to suppose the dominance of one hemisphere in the processing of various odours in non-human mammals. Although olfaction is the most important sensory domain for many mammals, lateralization of this sense is poorly studied in this group of animals, and the existing limited knowledge is based on experiments on laboratory and domestic mammals. Here we review the most important studies in this developing field, with an emphasis on the methods used. Most of the recent studies indicate the dominance of the right hemisphere in the processing of social and aversive odours and analysis of familiarity of the olfactory stimuli. Dominance of the left hemisphere was found only in a form of a slight trend in the perception of food odour. Almost all existing results on olfactory lateralization are in line with the well-studied patterns of visual lateralization. However, further focused investigations are needed to confirm this consistency. Studies on a wider range of species and stimuli will help to get a better understanding of the relative hemispheric roles in olfactory perception.

Keywords:

olfactory lateralization, nostril use, sensory lateralization, brain asymmetry, mammals

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Published
2022-05-04
How to Cite
Berezina, E., Giljov, A., & Karenina, K. (2022). Olfactory lateralization in non-human mammals: a mini-review. Biological Communications, 67(1), 49–56. https://doi.org/10.21638/spbu03.2022.105
Section
Review communications