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Title: Resting state functional connectivity changes induced by prior brain state are not network specific.
Austin Authors: Tailby, Chris ;Masterton, Richard A J;Huang, Jenny Y;Jackson, Graeme D ;Abbott, David F 
Affiliation: Department of Psychology, The University of Melbourne, Victoria, Australia
Department of Medicine, The University of Melbourne, Victoria, Australia
The Florey Institute of Neuroscience and Mental Health, The University of Melbourne, Austin Hospital, Victoria, Australia
Issue Date: 24-Nov-2014
Publication information: Neuroimage 2014; 106(): 428-40
Abstract: Resting state functional connectivity (rFC) is used to identify functionally related brain areas without requiring subjects to perform specific tasks. Previous work suggests that prior brain state, as determined by the activity engaged in immediately prior to collection of resting state data, can influence the networks recovered by rFC analyses. We determined the prevalence and network specificity of rFC changes induced by manipulations of prior state (including an unstructured (unconstrained) state, and language and motor tasks). Three blocks of rest data (one after each of the specified prior states) were acquired on each of 25 subjects. We hypothesised that prior state induced changes in rFC would be greatest within the networks most actively recruited by that prior state. Changes in rFC were greatest following the motor task and, contrary to our hypothesis, were not network specific. This was demonstrated by comparing (1) the timecourses within a set of ROIs selected on the basis of task-related de/activation, and (2) seed-based whole brain voxel-wise connectivity maps, seeded from local maxima in the task-related de/activation maps. Changes in connectivity strength tended to manifest as increases in rFC relative to that in the unstructured rest state, with change maps resembling partially complete maps of the primary sensory cortices and the cognitive control network. The majority of rFC changes occurred in areas moderately (but not weakly) connected to the seeds. Constrained prior states were associated with lower across-participant variance in rFC. This systematic investigation of the effect of prior brain state on rFC indicates that the rFC changes induced by prior brain state occur both in brain networks related to that brain activity and in networks nominally unrelated to that brain activity.
Gov't Doc #: 25463462
DOI: 10.1016/j.neuroimage.2014.11.037
Journal: NeuroImage
Type: Journal Article
Subjects: BOLD
Brain networks
Functional MRI
Functional connectivity
Resting state
Appears in Collections:Journal articles

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