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Erschienen in: Brain Topography 3/2012

01.07.2012 | Original Paper

Connectivity-based parcellation reveals interhemispheric differences in the insula

verfasst von: András Jakab, Péter P. Molnár, Péter Bogner, Monika Béres, Ervin L. Berényi

Erschienen in: Brain Topography | Ausgabe 3/2012

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Abstract

The aim of this work was to use probabilistic diffusion tractography to examine the organization of the human insular cortex based on the similarities of its remote projections. Forty right-handed healthy subjects (33.8 ± 12.7 years old) with no history of neurological injury were included in the study. After the spatial standardization of diffusion tensor images, insular cortical masks were delineated based on the Harvard–Oxford Cortical Atlas and were used to initiate fibertracking. Cluster analysis by the k-means algorithm was employed to partition the insular voxels into two groups that featured the most distinct distribution of connections. In order to perform volumetric comparisons, the assigned label maps were transformed back to space of the subjects’ native anatomical MR images. The outlines of the change in connectivity profile did not respect the known cytoarchitectural subdivisions and were shown to be independent from the gyral anatomy. Interhemispheric asymmetry in the volumes of connectivity-based subdivisions was observed putatively marking a leftward functional dominance of the anterior insula and its reciprocally interconnected targets which influences the size of insular area where similar connections are represented. The fractional anisotropy values were not significantly different between the hemipsheres or connectivity-based clusters; however, the mean diffusivity was higher in the anterior insula in both hemispheres.
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Metadaten
Titel
Connectivity-based parcellation reveals interhemispheric differences in the insula
verfasst von
András Jakab
Péter P. Molnár
Péter Bogner
Monika Béres
Ervin L. Berényi
Publikationsdatum
01.07.2012
Verlag
Springer US
Erschienen in
Brain Topography / Ausgabe 3/2012
Print ISSN: 0896-0267
Elektronische ISSN: 1573-6792
DOI
https://doi.org/10.1007/s10548-011-0205-y

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