Main effect of task on functional connectivity, interaction effects, and negative correlation between functional connectivity and number of errors on set-shift trials during the second session for the sham group. T statistic images for the switch > repeat contrast. Threshold at p = .001 (uncorrected) with an extent of k > 10 for the main effect (a), and p = .001 (uncorrected) with an extent-threshold of k > 5 for the interaction effects and regression (b, c) overlain on ch2better MNI template with MRIcron (http://www.mccauslandcenter.sc.edu/mricro/mricron). Coordinates are in MNI space. The colored bar indicates the Z values.