Journal Article

FZJ-2020-04608

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Signal diffusion along connectome gradients and inter-hub routing differentially contribute to dynamic human brain function

Park, B.-y. (Corresponding author) ; Vos de Wael, R. ; Paquola, C. ; Larivière, S. ; Benkarim, O. ; Royer, J. ; Tavakol, S. ; Cruces, R. R. ; Li, Q. ; Valk, S. L.FZJ* ; Margulies, D. S. ; Mišić, B. ; Bzdok, D. ; Smallwood, J. ; Bernhardt, B. C.

2021
Academic Press Orlando, Fla.

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Please use a persistent id in citations: http://hdl.handle.net/2128/26248  doi:10.1016/j.neuroimage.2020.117429

Abstract: Human cognition is dynamic, alternating over time between externally-focused states and more abstract, often self-generated, patterns of thought. Although cognitive neuroscience has documented how networks anchor particular modes of brain function, mechanisms that describe transitions between distinct functional states remain poorly understood. Here, we examined how time-varying changes in brain function emerge within the constraints imposed by macroscale structural network organization. Studying a large cohort of healthy adults (n = 326), we capitalized on manifold learning techniques that identify low dimensional representations of structural connectome organization and we decomposed neurophysiological activity into distinct functional states and their transition patterns using Hidden Markov Models. Structural connectome organization predicted dynamic transitions anchored in sensorimotor systems and those between sensorimotor and transmodal states. Connectome topology analyses revealed that transitions involving sensorimotor states traversed short and intermediary distances and adhered strongly to communication mechanisms of network diffusion. Conversely, transitions between transmodal states involved spatially distributed hubs and increasingly engaged long-range routing. These findings establish that the structure of the cortex is optimized to allow neural states the freedom to vary between distinct modes of processing, and so provides a key insight into the neural mechanisms that give rise to the flexibility of human cognition.Keywords: Hidden Markov Model; diffusion MRI; functional dynamics; gradients; multimodal imaging; structural connectome.

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Contributing Institute(s):

1. Gehirn & Verhalten (INM-7)

Research Program(s):

1. 572 - (Dys-)function and Plasticity (POF3-572) (POF3-572)

Appears in the scientific report 2021

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