Figure 3: Source-level EEG results for the stop-signal task.
From: Surprise disrupts cognition via a fronto-basal ganglia suppressive mechanism
(a) ERP back projection into channel space at component’s centre of gravity. Inset: average topographical IC projection in channel space (rectified to show positive at FCz). (b) MS-IC ERP onset on successful and failed stop trials. Points represent participants. Four participants had no significant P3-ERP on failed stop trials (i.e., plot shows N=16). Points below the grey identity line demarcate participants whose MS-IC onset was earlier on successful compared to failed stop-signals (paired samples t-test, N=16, t(15)=3.62, P=0.003, d=0.77), which illustrates the relation of the MS-IC EEG activity to the speed of stopping. (c) Correlation between MC-IC ERP onset on successful stop trials and SSRT in N=20. Dashed line denotes least squares fit (r=0.36, P=0.06).
