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Functional hemispheric segregation of sensory-motor laterality
Alexandre Jehan Marcori1, Victor Hugo Alves Okazaki2, Sebastian Ocklenburg3
1Londrina State University, Motor Neuroscience Research Group, Brazil; ICAN - Institute for Cognitive and Affective Neuroscience, MSH Medical School Hamburg, University of Applied Sciences and Medical University, Germany.
Neuropsychologia
|November 28, 2025
Summary
This study investigated sensory-motor laterality using a segregation bias model. Non-right-handers showed more atypical patterns, supporting the model, but sex differences were not found.
Area of Science:
- Neuroscience
- Human Behavior
- Developmental Psychology
Background:
- Functional laterality in motor and sensory domains is well-established, but its combined organization within individuals is less understood.
- Gerrits' 2024 segregation bias model offers a framework to test predictions about brain function lateralization and population phenotype distributions.
- This study applies the segregation bias model to examine sensory-motor laterality at the behavioral level.
Purpose of the Study:
- To investigate sensory-motor laterality using Gerrits' segregation bias model.
- To analyze behavioral laterality patterns (handedness, footedness, eyedness) in a large adult sample.
- To compare observed laterality distributions with the model's predictions and explore associations with sex and age.
Main Methods:
- A large sample (n=900, ages 11-70) completed the Global Lateral Preference Inventory.
- Laterality indices were calculated to classify individuals into typical functional segregation or deviation patterns.
- Observed distributions were compared against Gerrits' (2024) model predictions, with analyses including handedness, sex, and age.
Main Results:
- Findings partially supported the segregation bias model, with non-right-handers showing more atypical segregation patterns.
- Observed percentages differed from predictions, potentially due to methodological variations in behavioral inventories versus neuroimaging.
- No sex differences in segregation patterns were found, suggesting segregation bias principles may override sex-linked variability; young adults showed higher deviation rates.
Conclusions:
- The segregation model framework is extended to sensory-motor domains, demonstrating its utility.
- Findings emphasize the importance of multidimensional laterality assessments beyond handedness alone.
- The model has potential applications in neurodevelopmental, clinical, and research contexts.
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