Generalized psychophysiological interaction (gPPI) analysis
EVENTS, POSITIVE
gPPI analysis (To generate the physiological regressor for each model, we transformed our caudate and VS seeds from MNI space to each participant’s native space and then extracted the time series from the resulting native space ROIs. We entered the time series for All Positive Feedback and All Negative Feedback events as our psychological regressors, each convolved with a double-gamma HRF. Temporal derivatives of each psychological regressor were also included. PPI regressors were generated by multiplying each of the zero-centered (Second-level and group-level analyses followed similar procedures as those outlined in our original GLM. Similar to the whole-brain analysis, we also estimated group differences in state fatigue-related connectivity. We used a cluster-defining threshold of 