TY - JOUR T1 - Early-Course Unmedicated Schizophrenia Patients Exhibit Elevated Prefrontal Connectivity Associated with Longitudinal Change JF - The Journal of Neuroscience JO - J. Neurosci. SP - 267 LP - 286 DO - 10.1523/JNEUROSCI.2310-14.2015 VL - 35 IS - 1 AU - Alan Anticevic AU - Xinyu Hu AU - Yuan Xiao AU - Junmei Hu AU - Fei Li AU - Feng Bi AU - Michael W. Cole AU - Aleksandar Savic AU - Genevieve J. Yang AU - Grega Repovs AU - John D. Murray AU - Xiao-Jing Wang AU - Xiaoqi Huang AU - Su Lui AU - John H. Krystal AU - Qiyong Gong Y1 - 2015/01/07 UR - http://www.jneurosci.org/content/35/1/267.abstract N2 - Strong evidence implicates prefrontal cortex (PFC) as a major source of functional impairment in severe mental illness such as schizophrenia. Numerous schizophrenia studies report deficits in PFC structure, activation, and functional connectivity in patients with chronic illness, suggesting that deficient PFC functional connectivity occurs in this disorder. However, the PFC functional connectivity patterns during illness onset and its longitudinal progression remain uncharacterized. Emerging evidence suggests that early-course schizophrenia involves increased PFC glutamate, which might elevate PFC functional connectivity. To test this hypothesis, we examined 129 non-medicated, human subjects diagnosed with early-course schizophrenia and 106 matched healthy human subjects using both whole-brain data-driven and hypothesis-driven PFC analyses of resting-state fMRI. We identified increased PFC connectivity in early-course patients, predictive of symptoms and diagnostic classification, but less evidence for “hypoconnectivity.” At the whole-brain level, we observed “hyperconnectivity” around areas centered on the default system, with modest overlap with PFC-specific effects. The PFC hyperconnectivity normalized for a subset of the sample followed longitudinally (n = 25), which also predicted immediate symptom improvement. Biologically informed computational modeling implicates altered overall connection strength in schizophrenia. The initial hyperconnectivity, which may decrease longitudinally, could have prognostic and therapeutic implications. ER -