I. Introduction
Functional connectivity analysis has gained increasing popularity due to its ability to characterize functional organization of the human brain using noninvasive neuroimaging techniques [1]. Resting-state functional connectivity refers to the temporal synchronization of spatially remote spontaneous neural activity in the absence of a structured task or stimulus [2], [3]. Resting-state studies have shown functional connections of the brain not only in healthy people and but also in diseased populations where conducting task-related experiments is often challenging. Potential clinical applications include but not limited to infants with neurodevelopmental disorders, hearing/vision impairments or older adults with neurodegenerative disorders [4].