Table 2. Electrode classification.

Overview of number of electrodes (absolute and percentage of total, N=621) per class: (1) stimulus selective, (2) response preparation/execution, (3) feedback (feedback-only and total feedback, including combination with other types), and (4) task duration, as well as non-classified electrodes (N/C). Last column indicates per type how many electrodes were selective for condition.

Type	Number of electrodes	Condition selective
Stimulus	N = 135 22% of total	N = 27 20% of this type
Response	N = 82 13% of total	N = 21 26% of this type
Feedback	N = 25 (176) 4 (28) % of total	N = 4 (64) 16 (36) % of this type
Task duration	N = 211 34% of total	N = 71 34% of this type
N/C	N = 168 27% of total	N = 37 22% of this type