Time-varying whole-brain functional network connectivity coupled to task engagement

Hua Xie, Javier Gonzalez-Castillo, Daniel A. Handwerker, Peter A. Bandettini, Vince D. Calhoun, Gang Chen, Eswar Damaraju, Xiangyu Liu, Sunanda Mitra

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Brain functional connectivity (FC), as measured by blood oxygenation level-dependent (BOLD) signal, fluctuates at the scale of 10s of seconds. It has recently been found that whole-brain dynamic FC (dFC) patterns contain sufficient information to permit identification of ongoing tasks. Here, we hypothesize that dFC patterns carry fine-grained information that allows for tracking short-term task engagement levels (i.e., 10s of seconds long). To test this hypothesis, 25 subjects were scanned continuously for 25 min while they performed and transitioned between four different tasks: working memory, visual attention, math, and rest. First, we estimated dFC patterns by using a sliding window approach. Next, we extracted two engagement-specific FC patterns representing active engagement and passive engagement by using k-means clustering. Then, we derived three metrics from whole-brain dFC patterns to track engagement level, that is, dissimilarity between dFC patterns and engagement-specific FC patterns, and the level of brainwide integration level. Finally, those engagement markers were evaluated against windowed task performance by using a linear mixed effects model. Significant relationships were observed between abovementioned metrics and windowed task performance for the working memory task only. These findings partially confirm our hypothesis and underscore the potential of whole-brain dFC to track short-term task engagement levels.

Original languageEnglish
Pages (from-to)49-66
Number of pages18
JournalNetwork Neuroscience
Volume3
Issue number1
DOIs
StatePublished - Jan 1 2018

Keywords

  • Brainwide integration
  • Cognitive dynamics
  • Cognitive marker
  • Task-evoked connectivity dynamics
  • Whole-brain connectivity pattern

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