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Perspective

Handedness in Animals and Plants

by
Silvia Guerra
*,
Umberto Castiello
,
Bianca Bonato
and
Marco Dadda
Department of General Psychology (DPG), University of Padova, 35131 Padova, Italy
*
Author to whom correspondence should be addressed.
Biology 2024, 13(7), 502; https://doi.org/10.3390/biology13070502
Submission received: 3 May 2024 / Revised: 1 July 2024 / Accepted: 4 July 2024 / Published: 5 July 2024

Simple Summary

Animals and plants present asymmetric structures in nature. The most relevant motor behavioural manifestation of lateralisation is handedness, which is defined as the consistent use of one effector rather than the other in performing certain tasks. In animals, including human beings, handedness is associated with the presence of a nervous system. Researchers have recently challenged this idea by reporting that even organisms without a nervous system, such as plants, exhibit similarities with animals in terms of directional movement patterns (i.e., right-handed prevalence), opening up the possibility of a comparative study of handedness across taxa. Here, we advance a comparative approach to the study of handedness in plants by adopting the experimental paradigms already used to research laterality in various animal species.

Abstract

Structural and functional asymmetries are traceable in every form of life, and some lateralities are homologous. Functionally speaking, the division of labour between the two halves of the brain is a basic characteristic of the nervous system that arose even before the appearance of vertebrates. The most well-known expression of this specialisation in humans is hand dominance, also known as handedness. Even if hand/limb/paw dominance is far more commonly associated with the presence of a nervous system, it is also observed in its own form in aneural organisms, such as plants. To date, little is known regarding the possible functional significance of this dominance in plants, and many questions remain open (among them, whether it reflects a generalised behavioural asymmetry). Here, we propose a comparative approach to the study of handedness, including plants, by taking advantage of the experimental models and paradigms already used to study laterality in humans and various animal species. By taking this approach, we aim to enrich our knowledge of the concept of handedness across natural kingdoms.
Keywords: handedness; climbing plants; lateralisation; asymmetry; chirality; animals; humans; kinematics; comparative biology handedness; climbing plants; lateralisation; asymmetry; chirality; animals; humans; kinematics; comparative biology

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MDPI and ACS Style

Guerra, S.; Castiello, U.; Bonato, B.; Dadda, M. Handedness in Animals and Plants. Biology 2024, 13, 502. https://doi.org/10.3390/biology13070502

AMA Style

Guerra S, Castiello U, Bonato B, Dadda M. Handedness in Animals and Plants. Biology. 2024; 13(7):502. https://doi.org/10.3390/biology13070502

Chicago/Turabian Style

Guerra, Silvia, Umberto Castiello, Bianca Bonato, and Marco Dadda. 2024. "Handedness in Animals and Plants" Biology 13, no. 7: 502. https://doi.org/10.3390/biology13070502

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