Abstract
The time-to-time fluctuations (TTFs) of resting-state brain activity as captured by resting-state fMRI (rsfMRI) have been repeatedly shown to be informative of functional brain structures and disease-related alterations. TTFs can be characterized by the mean and the range of successive difference. The former can be measured with the mean squared successive difference (MSSD), which is mathematically similar to standard deviation; the latter can be calculated by the variability of the successive difference (VSD). The purpose of this study was to evaluate both the resting state-MSSD and VSD of rsfMRI regarding their test–retest stability, sensitivity to brain state change, as well as their biological meanings. We hypothesized that MSSD and VSD are reliable in resting brain; both measures are sensitive to brain state changes such as eyes-open compared to eyes-closed condition; both are predictive of age. These hypotheses were tested with three rsfMRI datasets and proven true, suggesting both MSSD and VSD as reliable and useful tools for resting-state studies.
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Acknowledgments
This study was supported by the Hangzhou Qianjiang Endowed Professor Program, the Youth 1000 Talent Program of China, Natural Science Foundation of Zhejiang Province Grant LZ15H180001, and NIH Grant 1R56DA036556. Data acquisition for dataset 3 was supported by National Natural Science Foundation of China Grant 30770594 and the National High Technology Program of China (863) Grant 2008AA02Z405.
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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. For this type of retrospective study, formal consent is not required.
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Li, Z., Zang, YF., Ding, J. et al. Assessing the mean strength and variations of the time-to-time fluctuations of resting-state brain activity. Med Biol Eng Comput 55, 631–640 (2017). https://doi.org/10.1007/s11517-016-1544-3
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DOI: https://doi.org/10.1007/s11517-016-1544-3