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It Is Not Just in the Genes

Research Division Experimental and Molecular Psychiatry, Department of Psychiatry, Psychotherapy and Preventive Medicine, LWL University Hospital, Ruhr-University Bochum, 44780 Bochum, Germany
Academic Editor: Sebastian Ocklenburg
Symmetry 2021, 13(10), 1815;
Received: 4 September 2021 / Revised: 22 September 2021 / Accepted: 23 September 2021 / Published: 29 September 2021
(This article belongs to the Special Issue Cognitive and Neurophysiological Models of Brain Asymmetry)
Asymmetries in the functional and structural organization of the nervous system are widespread in the animal kingdom and especially characterize the human brain. Although there is little doubt that asymmetries arise through genetic and nongenetic factors, an overarching model to explain the development of functional lateralization patterns is still lacking. Current genetic psychology collects data on genes relevant to brain lateralizations, while animal research provides information on the cellular mechanisms mediating the effects of not only genetic but also environmental factors. This review combines data from human and animal research (especially on birds) and outlines a multi-level model for asymmetry formation. The relative impact of genetic and nongenetic factors varies between different developmental phases and neuronal structures. The basic lateralized organization of a brain is already established through genetically controlled embryonic events. During ongoing development, hemispheric specialization increases for specific functions and subsystems interact to shape the final functional organization of a brain. In particular, these developmental steps are influenced by environmental experiences, which regulate the fine-tuning of neural networks via processes that are referred to as ontogenetic plasticity. The plastic potential of the nervous system could be decisive for the evolutionary success of lateralized brains. View Full-Text
Keywords: avian brain; brain asymmetries; hemispheric lateralization; ontogeny; epigenetic; neuronal plasticity; visual system avian brain; brain asymmetries; hemispheric lateralization; ontogeny; epigenetic; neuronal plasticity; visual system
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Manns, M. It Is Not Just in the Genes. Symmetry 2021, 13, 1815.

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Manns M. It Is Not Just in the Genes. Symmetry. 2021; 13(10):1815.

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Manns, Martina. 2021. "It Is Not Just in the Genes" Symmetry 13, no. 10: 1815.

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