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Blind Subgrouping of Task-based fMRI

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Abstract

Significant heterogeneity in network structures reflecting individuals’ dynamic processes can exist within subgroups of people (e.g., diagnostic category, gender). This makes it difficult to make inferences regarding these predefined subgroups. For this reason, researchers sometimes wish to identify subsets of individuals who have similarities in their dynamic processes regardless of any predefined category. This requires unsupervised classification of individuals based on similarities in their dynamic processes, or equivalently, in this case, similarities in their network structures of edges. The present paper tests a recently developed algorithm, S-GIMME, that takes into account heterogeneity across individuals with the aim of providing subgroup membership and precise information about the specific network structures that differentiate subgroups. The algorithm has previously provided robust and accurate classification when evaluated with large-scale simulation studies but has not yet been validated on empirical data. Here, we investigate S-GIMME’s ability to differentiate, in a purely data-driven manner, between brain states explicitly induced through different tasks in a new fMRI dataset. The results provide new evidence that the algorithm was able to resolve, in an unsupervised data-driven manner, the differences between different active brain states in empirical fMRI data to segregate individuals and arrive at subgroup-specific network structures of edges. The ability to arrive at subgroups that correspond to empirically designed fMRI task conditions, with no biasing or priors, suggests this data-driven approach can be a powerful addition to existing methods for unsupervised classification of individuals based on their dynamic processes.

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Authors and Affiliations

  1. Quantitative Developmental Systems Methodology Core, Department of Human Development and Family Studies, The Pennsylvania State University, Health and Human Development Building, University Park, PA, 16802, USA

    Zachary F. Fisher

  2. Duke University, Durham, NC, USA

    Jonathan Parsons

  3. The University of North Carolina at Chapel Hill, Chapel Hill, NC, USA

    Kathleen M. Gates & Joseph B. Hopfinger

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  1. Zachary F. Fisher
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  2. Jonathan Parsons
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Fisher, Z.F., Parsons, J., Gates, K.M. et al. Blind Subgrouping of Task-based fMRI. Psychometrika 88, 434–455 (2023). https://doi.org/10.1007/s11336-023-09907-8

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