Abstract
Integrating the underlying brain circuit's structural and functional architecture is required to explore the functional organization of cognitive networks. In that regard, we recently introduced the Functionnectome. This structural–functional method combines an fMRI acquisition with tractography-derived white matter connectivity data to map cognitive processes onto the white matter. However, this multimodal integration faces three significant challenges: (1) the necessarily limited overlap between tractography streamlines and the grey matter, which may reduce the amount of functional signal associated with the related structural connectivity; (2) the scrambling effect of crossing fibers on functional signal, as a single voxel in such regions can be structurally connected to several cognitive networks with heterogeneous functional signals; and (3) the difficulty of interpretation of the resulting cognitive maps, as crossing and overlapping white matter tracts can obscure the organization of the studied network. In the present study, we tackled these problems by developing a streamline-extension procedure and dividing the white matter anatomical priors between association, commissural, and projection fibers. This approach significantly improved the characterization of the white matter involvement in the studied cognitive processes. The new Functionnectome priors produced are now readily available, and the analysis workflow highlighted here should also be generalizable to other structural–functional approaches.
Graphical abstract
We improved the Functionnectome approach to better study the involvement of white matter in brain function by separating the analysis of the three classes of white matter fibers (association, commissural, and projection fibers). This step successfully clarified the activation maps and increased their statistical significance.
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Availability of data and materials
All the raw anatomical and functional data are available on the HCP website (https://db.humanconnectome.org/). The unthresholded z-maps are freely available on Neurovault (https://identifiers.org/neurovault.collection:13538). The anatomical priors are freely available with the Functionnectome toolbox (https://github.com/NotaCS/Functionnectome).
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Acknowledgements
This project has received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program (Grant agreement No. 818521). Data were provided by the Human Connectome Project, WU-Minn Consortium (Principal Investigators: David Van Essen and Kamil Ugurbil; 1U54MH091657) funded by the 16 NIH Institutes and Centers that support the NIH Blueprint for Neuroscience Research and by the McDonnell Center for Systems Neuroscience at Washington University. Victor Nozais received financial support for this project from the “Consulat Général de France à Québec” and the “Conseil Franco-Québécois de Coopération Universitaire” as part of the Samuel de Champlain Program for the Development of Strategic Partnerships in Education and Research. Additionally, this work was conducted in the framework of the University of Bordeaux’s IHU ‘Precision & Global Vascular Brain Health Institute—VBHI’, which received financial support from the French government.
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Nozais, V., Theaud, G., Descoteaux, M. et al. Improved Functionnectome by dissociating the contributions of white matter fiber classes to functional activation. Brain Struct Funct 228, 2165–2177 (2023). https://doi.org/10.1007/s00429-023-02714-y
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DOI: https://doi.org/10.1007/s00429-023-02714-y