The goal of the present study is to examine whether hippocampal and frontal lobe circuits of patients with suspected TAI differ from those of healthy individuals during resting state. Given hippocampal and frontal lobe injuries are common after TAI, 23, 24 and subsequent memory and executive function deficits are frequently reported,25, 26 we hypothesize patients with TAI will demonstrate distinct hippocampal and frontal lobe connectivity patterns and weaker bilateral connectivity than controls. Furthermore, we will examine whether the degree of functional connectivity in these regions correlate with test performance in their respective neurocognitive domains.