2026 Toward a better measure of functional laterality: Comparing and refini…
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Taeyoung Lee, Kyung Hwan Kim, Seo Yeong Ha, Hang Joon Jo,
Toward a better measure of functional laterality: Comparing and refining laterality indices in resting-state functional connectivity,
NeuroImage,
Volume 328,
2026,
121782,
ISSN 1053-8119,
https://doi.org/10.1016/j.neuroimage.2026.121782.
(https://www.sciencedirect.com/science/article/pii/S105381192600100X)
Abstract: Systematic investigations into the lateralized human brain have revealed a bivariate functional architecture that underpins distinct cognitive processes. This architecture manifests through inter- and intra-hemispheric lateralization, captured respectively by neural integration and segregation. In this study, we conducted a comprehensive evaluation of multiple quantitative laterality metrics in resting-state fMRI connectivity, using conceptual models to illustrate how inter- and intra-hemispheric correlations shape functional lateralization. We further highlight the critical influence of factors such as correlation sign, correlation coefficient distribution, and statistical thresholding methodology on the interpretation of functional connectivity-based laterality indices. Our findings show that, in our dataset, laterality metrics based on positive-only functional connectivity with a lenient connection-level threshold most consistently capture established relationships between functional brain lateralization and performance in language and visuospatial domains.
Keywords: Brain Asymmetry; Functional Laterality; Resting-State fMRI; Integration; Segregation
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