Parallel Interdigitated Distributed Networks within the Individual Estimated by Intrinsic Functional Connectivity.
Certain organizational features of brain networks present in the individual are lost when central tendencies are examined in the group. Here we investigated the detailed network organization of four individuals each scanned 24 times using MRI. We discovered that the distributed network known as the default network is comprised of two separate networks possessing adjacent regions in eight or more cortical zones. A distinction between the networks is that one is coupled to the hippocampal formation while the other is not. Further exploration revealed that these two networks were juxtaposed with additional networks that themselves fractionate group-defined networks. The collective networks display a repeating spatial progression in multiple cortical zones, suggesting that they are embedded within a broad macroscale gradient. Regions contributing to the newly defined networks are spatially variable across individuals and adjacent to distinct networks, raising issues for network estimation in group-averaged data and applied endeavors, including targeted neuromodulation.
['Braga|Rodrigo M|RM|', 'Buckner|Randy L|RL|']
D001931:Brain Mapping D002540:Cerebral Cortex D006624:Hippocampus D006801:Humans D007091:Image Processing, Computer-Assisted D008279:Magnetic Resonance Imaging D009415:Nerve Net D009434:Neural Pathways
default network association cortex brain systems dorsal attention network frontoparietal network hippocampus memory