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Neurofunctional Segmentation Shifts in the Hippocampus

Robinson, JL and Zhou, X and Bird, RT and Leavitt, MJ and Nichols, SJ and Blaine, SK and Deshpande, G (2021) Neurofunctional Segmentation Shifts in the Hippocampus. In: Frontiers in Human Neuroscience, 15 .

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Official URL: https://doi.org/10.3389/fnhum.2021.729836


The hippocampus is one of the most phylogenetically preserved structures in the mammalian brain. Engaged in a host of diverse cognitive processes, there has been increasing interest in understanding how the hippocampus dynamically supports these functions. One of the lingering questions is how to reconcile the seemingly disparate cytoarchitectonic organization, which favors a dorsal-ventral layering, with the neurofunctional topography, which has strong support for longitudinal axis (anterior-posterior) and medial-lateral orientation. More recently, meta-analytically driven (e.g., big data) approaches have been employed, however, the question remains whether they are sensitive to important task-specific features such as context, cognitive processes recruited, or the type of stimulus being presented. Here, we used hierarchical clustering on functional magnetic resonance imaging (fMRI) data acquired from healthy individuals at 7T using a battery of tasks that engage the hippocampus to determine whether stimulus or task features influence cluster profiles in the left and right hippocampus. Our data suggest that resting state clustering appears to favor the cytoarchitectonic organization, while task-based clustering favors the neurofunctional clustering. Furthermore, encoding tasks were more sensitive to stimulus type than were recognition tasks. Interestingly, a face-name paired associate task had nearly identical clustering profiles for both the encoding and recognition conditions of the task, which were qualitatively morphometrically different than simple encoding of words or faces. Finally, corroborating previous research, the left hippocampus had more stable cluster profiles compared to the right hippocampus. Together, our data suggest that task-based and resting state cluster profiles are different and may account for the disparity or inconsistency in results across studies. Copyright © 2021 Robinson, Zhou, Bird, Leavitt, Nichols, Blaine and Deshpande.

Item Type: Journal Article
Publication: Frontiers in Human Neuroscience
Publisher: Frontiers Media S.A.
Additional Information: The copyright for this article belongs to Author
Keywords: adult; article; big data; controlled study; female; functional magnetic resonance imaging; hierarchical clustering; human; human experiment; left hippocampus; male; memory; right hippocampus; topography
Department/Centre: Autonomous Societies / Centres > Centre for Brain Research
Date Deposited: 03 Dec 2021 08:46
Last Modified: 03 Dec 2021 08:46
URI: http://eprints.iisc.ac.in/id/eprint/70614

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