Scatter plots showing change in FC between (A) NAcc and FPC, (B) NAcc and PCC and (C) sgACC and FPC. Each dot represents FC change in an individual subject (Time 2 z-score minus Time 1 z-scores). Red bars show significant difference between groups. NAcc, nucleus accumbens; FPC, frontopolar cortex; PCC, posterior cingulate cortex; sgACC, subgenual anterior cingulate; REL, stimulant addicts that relapsed over six months; ABS, stimulant addicts that remained abstinent over six months; FC, functional connectivity.