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