This document summarizes a study that used network theory and graph metrics to characterize functional brain networks in individuals at clinical high risk of developing psychosis (the at-risk mental state, or ARMS). The study found differences in anterior cingulate cortex network metrics between ARMS subjects who later developed psychosis compared to those who did not and healthy controls. Specifically, ARMS subjects who transitioned to psychosis had reduced contribution of the anterior cingulate cortex to information routing in executive networks. These network abnormalities differentiated transitioned ARMS subjects from both controls and non-transitioned ARMS subjects, and were present prior to psychosis onset.