Variance and Autocorrelation of the Spontaneous Slow Brain Activity

Abstract

Slow (r₁). These two maps had distinct spatial distributions and the values were significantly different among the subdivisions of the precuneus and posterior cingulate cortex that were identified in functional connectivity (FC) studies. The results reinforce the functional segregation of these subdivisions and indicate that the intrinsic properties of the slow brain activity have physiological relevance. Further, we propose a sample size (degree of freedom) correction when assessing the statistical significance of FC strength with r₁ values, which enables a better understanding of the network changes related to various brain diseases.