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Paper · 2607.10931 · 2026

Fast Whole-Brain, Geometry-Aware Functional Alignment for Cross-Subject Decoding

Bertrand Thirion, Pierre-Louis Barbarant, Florent Meyniel

arXiv · PDF · Open in the Atlas

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Abstract

Decoding brain activity is useful for characterizing brain processes and understanding the functional architecture underlying cognition. However, the inter-individual variability in brain response patterns limits the development of decoders that generalize across individuals. A solution to this challenge is functional alignment: aligning functional data across individuals before training populationlevel decoders. The core issue is to strike the balance between aligning functional features and preserving the anatomical structure, while maintaining computational efficiency. We introduce a new functional alignment method for fMRI, SpectralOT, that embeds cortical geometry into Laplace-Beltrami eigenmodes along functional data to regularize the alignment.

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