Resting state functional connectivity is a method used in neuroscience to study the intrinsic functional organization of the brain in the absence of any specific task or stimulus. This approach involves measuring correlations in spontaneous neural activity across various regions of the brain, using techniques such as functional magnetic resonance imaging (fMRI). Resting state functional connectivity can provide insights into the functional architecture of the brain, identifying patterns of connectivity that are consistent across individuals and can be used to examine changes in brain function associated with various neurological and psychiatric conditions. This research area has greatly advanced our understanding of brain networks and their role in cognition, behavior, and disease.