Journal
HUMAN BRAIN MAPPING
Volume 34, Issue 12, Pages 3204-3215Publisher
WILEY-BLACKWELL
DOI: 10.1002/hbm.22136
Keywords
resting-state fMRI; ALFF; N-back working memory; load dependency; behavior
Funding
- Intramural Research Program of the National Institute on Drug Abuse (NIDA)
- National Institutes of Health (NIH)
- Natural Science Foundation of China [81020108022]
- China's National Strategic Basic Research Program (973) [2012CB720700]
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Although resting-state brain activity has been demonstrated to correspond with task-evoked brain activation, the relationship between intrinsic and evoked brain activity has not been fully characterized. For example, it is unclear whether intrinsic activity can also predict task-evoked deactivation and whether the rest-task relationship is dependent on task load. In this study, we addressed these issues on 40 healthy control subjects using resting-state and task-driven [N-back working memory (WM) task] functional magnetic resonance imaging data collected in the same session. Using amplitude of low-frequency fluctuation (ALFF) as an index of intrinsic resting-state activity, we found that ALFF in the middle frontal gyrus and inferior/superior parietal lobules was positively correlated with WM task-evoked activation, while ALFF in the medial prefrontal cortex, posterior cingulate cortex, superior frontal gyrus, superior temporal gyrus, and fusiform gyrus was negatively correlated with WM task-evoked deactivation. Further, the relationship between the intrinsic resting-state activity and task-evoked activation in lateral/superior frontal gyri, inferior/superior parietal lobules, superior temporal gyrus, and midline regions was stronger at higher WM task loads. In addition, both resting-state activity and the task-evoked activation in the superior parietal lobule/precuneus were significantly correlated with the WM task behavioral performance, explaining similar portions of intersubject performance variance. Together, these findings suggest that intrinsic resting-state activity facilitates or is permissive of specific brain circuit engagement to perform a cognitive task, and that resting activity can predict subsequent task-evoked brain responses and behavioral performance. Hum Brain Mapp 34:3204-3215, 2013. (c) 2012 Wiley Periodicals, Inc.
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