Situating the default-mode network along a principal gradient of macroscale cortical organization
Margulies DS., Ghosh SS., Goulas A., Falkiewicz M., Huntenburg JM., Langs G., Bezgin G., Eickhoff SB., Castellanos FX., Petrides M., Jefferies E., Smallwood J.
SignificanceWe describe an overarching organization of large-scale connectivity that situates the default-mode network at the opposite end of a spectrum from primary sensory and motor regions. This topography, based on the differentiation of connectivity patterns, is also embedded in the spatial distance along the cortical surface between these respective systems. In addition, this connectivity gradient accounts for the respective positions of canonical networks and captures a functional spectrum from perception and action to more abstract cognitive functions. These results suggest that the default-mode network consists of regions at the top of a representational hierarchy that describe the current cognitive landscape in the most abstract terms.