Abstract
The midline thalamus is critical for flexible cognition, memory, and stress regulation in humans and its dysfunction is associated with several neurological and psychiatric disorders, including Alzheimer’s disease, schizophrenia, and depression. Despite the pervasive role of the midline thalamus in cognition and disease, there is a limited understanding of its function in humans, likely due to the absence of a rigorous noninvasive neuroimaging methodology to identify its location. Here, we introduce a new method for identifying the midline thalamus in vivo using probabilistic tractography and k-means clustering with diffusion weighted imaging data. This approach clusters thalamic voxels based on data-driven cortical and subcortical connectivity profiles and then segments the midline thalamus according to anatomical connectivity tracer studies in rodents and macaques. Results from two different diffusion weighted imaging sets, including adult data (22–35 years) from the Human Connectome Project (n = 127) and adolescent data (9–14 years) collected at Florida International University (n = 34) showed that this approach reliably classifies midline thalamic clusters. As expected, these clusters were most evident along the dorsal/ventral extent of the third ventricle and were primarily connected to the agranular medial prefrontal cortex (e.g., anterior cingulate cortex), nucleus accumbens, and medial temporal lobe regions. The midline thalamus was then bisected based on a human brain atlas into a dorsal midline thalamic cluster (paraventricular and paratenial nuclei) and a ventral midline thalamic cluster (rhomboid and reuniens nuclei). This anatomical connectivity-based identification of the midline thalamus offers the opportunity for necessary investigation of this region in vivo in the human brain and how it relates to cognitive functions in humans, and to psychiatric and neurological disorders.
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The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.
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We thank Adam Kimbler and Nathan Muncy for help with the analytical scripts.
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This work was supported by Feinberg Foundation and FIU University Graduate School Dissertation Year Fellowship for research funding.
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P.R. and M.V.R.N. collected data. P.R. prepared figures. All authors contributed to analysis (most of the analysis was done by P.R. and A.M.), writing, and reviewing the manuscript.
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Reeders, P.C., Rivera Núñez, M.V., Vertes, R.P. et al. Identifying the midline thalamus in humans in vivo. Brain Struct Funct 228, 1835–1847 (2023). https://doi.org/10.1007/s00429-022-02607-6
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DOI: https://doi.org/10.1007/s00429-022-02607-6