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. Author manuscript; available in PMC: 2017 May 15.
Published in final edited form as: Neuroimage. 2016 Feb 22;132:247–260. doi: 10.1016/j.neuroimage.2016.02.046

Table 1.

Number of Trials by Number of Participants needed for a Reliable Signal by Neuroimaging Measure

Measure N = 10 N = 20 N = 30 N = 40 N = 50 N = 60 N = 70 N = 80 N = 90 All
ERN/Ne 2 2 6 2 2 2 2 2 2 2
Pe 10 4 4 4 4 6 4 4 4 4
PC1 2 4 4 2 4 2 2 4 4 4
PC2 4 10 6 6 2 6 6 4 2 4
PC3 6 4 2 6 4 4 4 4 2 4
PC4 2 2 4 2 2 2 2 2 2 2
tPC1 14 4 8 4 10 4 6 8 8 8
tPC2 12 12 2 2 8 6 8 8 8 8
tPC3 N/A 6 10 6 4 8 8 4 8 8
tPC4 4 2 4 10 2 2 4 4 4 4
dPC1 2 4 2 2 4 2 2 2 2 2
dPC2 2 4 2 2 4 2 2 2 2 2
dPC3 2 4 2 2 4 4 4 2 4 4
dPC4 14 6 4 4 4 10 4 4 4 4
dPC5 6 6 6 6 4 6 2 2 2 2
CACC N/A 8 14 6 4 4 6 4 4 4
MeFG 8 10 8 6 4 6 6 6 6 6
RACC N/A N/A 14 6 4 8 6 8 8 8
MiFG N/A 8 14 6 4 10 6 6 8 8
ACC-IC 4 6 6 6 6 6 6 6 6 6

Note: A summary of reliability tests are presented by reporting the minimum number of trials needed to reach .70 reliability for each randomly selected number of participants. For example, the ERN/Ne requires only 2 trials if all participants are included in the analysis but as many as 6 trials if 30 participants are included in the analysis.