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White and gray matter correlates of theory of mind in autism: a voxel-based morphometry study

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Abstract

Autism spectrum disorder (ASD) is characterized by difficulties in theory of mind (ToM) and social communication. Studying structural and functional correlates of ToM in the brain and how autistic and nonautistic groups differ in terms of these correlates can help with diagnosis and understanding the biological mechanisms of ASD. In this study, we investigated white matter volume (WMV) and gray matter volume (GMV) differences between matching autistic and nonautistic samples, and how these structural features relate to age and ToM skills, indexed by the Reading the Mind in the Eyes (RMIE) measure. The results showed widespread GMV and WMV differences between the two groups in regions crucial for social processes. The autistic group did not express the typically observed negative GMV and positive WMV correlations with age at the same level as the nonautistic group, pointing to abnormalities in developmental structural changes. In addition, we found differences between the two groups in how GMV relates to ToM, particularly in the left frontal regions, and how WMV relates to ToM, mostly in the cingulate and corpus callosum. Finally, GMV in the left insula, a region that is part of the salience network, was found to be crucial in distinguishing ToM performance between the two groups.

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Data availability

Thrersholded statistical maps for all contrasts presented in the results are available at https://identifiers.org/neurovault.collection:13948. The raw data and analysis scripts that support the findings of this study are available from the corresponding author, FS, upon reasonable request.

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The authors declare that no funds, grants, or other support were received during the preparation of this manuscript.

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Contributions

FS: Conceptualization, methodology, analysis, software, writing, and editing. KM: Writing and editing. RK: Data collection, conceptualization, methodology, writing, and editing.

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Correspondence to Firat Soylu.

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The authors have no relevant financial or non-financial interests to disclose.

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This study was performed in line with the principles of the Declaration of Helsinki. Approval was granted by the Ethics Committee of the University of Alabama.

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Informed consent was obtained from all individual participants included in the study.

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Soylu, F., May, K. & Kana, R. White and gray matter correlates of theory of mind in autism: a voxel-based morphometry study. Brain Struct Funct 228, 1671–1689 (2023). https://doi.org/10.1007/s00429-023-02680-5

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  • DOI: https://doi.org/10.1007/s00429-023-02680-5

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