Group Comparisons
ERN. There were no main effects of group, F (2, 75) =
0.29, p = .751, η2p = 0.01 or
task, F (1, 75) = 0.09, p = .769,
η2p = 0.00 for the ERN. There was no
significant group x time interaction, F (2, 75) = 0.66, p =
.519, η2p = 0.02. Contrary to
hypotheses, these results indicated no differences in the ERN between
the simulated discarding and neutral tasks, and no differences between
the HD and control groups. See Table 2 for group means and standard
deviations and Figure 3 for grand average waveforms depicting ERN
difference waves (error – correct) waveforms for the neutral and
discarding tasks. See Table S1 in the Supplement for estimated marginal
means controlling for age and 95% confidence intervals.
Table 2
Means and Standard Deviations ofPsychophysiological
Measures