To estimate the reliability of the N250, we correlated the amplitudes of
the first and second half of the experiment. For the target
face-elicited N250 this correlation was r = 0.748, yielding good
reliability after Spearman-Brown correction (0.855). For
high-distinctive non-target faces the correlation was r = 0.876
and for low-distinctive non-target faces it was r = 0.864,
yielding excellent Spearman-Brown corrected reliabilities of 0.934 and
0.927, respectively.