Fig. 3.

Illustration of statistical rank estimation for each individual resting-state fMRI signal matrix. As mentioned in Section 2.1, the total number of scans is 33. By using the rank estimation technique (Shen et al., 2014; Wen et al., 2012), the final rank estimation for most individuals is equal or very close to 400; only one rank estimation is 378 (less than 400). The statistical results of rank estimation indicate that the number of dictionary atom 400 is reasonable.