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Fig. 8.7 a Ne source sLORETA localization. The source is localized in BA 32. b Theta source
sLORETA localization. The source is localized in BA 6. For each image, from left to right are the
axial, sagittal, and coronal views across the maximum. The images a and b are scaled to their own
maximum. The activity is color-coded with black representing the maximum and transparent
representing zero. Legend A = anterior; P = posterior; S = superior; I = inferior; L = left; R = right
8.9.5 Error Expectation
We then studied the impact of the error expectation on the two identi
ed sources
identi
ed (Ne and ERS). Each trial could outcome one out of four results: unex-
pected errors (UE), expected errors (EE), expected corrects (EC), and unexpected
corrects (UC). Since most subjects reported no trials from the UC condition, we
only studied the
first three outcomes. Only subjects providing at least four trials for
each condition were kept. Three further subjects were therefore excluded from this
analysis. For each component, a one-way repeated-measure ANOVA with factor
at three levels was applied i) to the temporal signal averaged
over time window [450 ms 520 ms] for the Ne source and ii) to the power signal
outcome feedback
cant time window [300 ms
600 ms] for the theta source. For the Ne source, no signi
filtered between 5 and 8 Hz and averaged over signi
cant result was found. For
the theta source, the means of the three outcomes were not all equal ( F = 4.75;
p = 0.0138). All pair-wise post hoc tests corrected by Bonferroni method showed
 
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