Figure 3. Grand average waveforms depicting ERN difference waves (error
– correct) waveforms for neutral and discarding tasks. The left
waveform depicts the neutral task, and the right waveform depicts the
discarding task. The temporal region (50-150ms) where the mean ERN is
measured is demarcated by the grey rectangle.
Alpha asymmetry. There were no significant group differences in
alpha asymmetry, F (2, 81) = 2.43, p = .094,
η2p = 0.06 (see Table 2).
Psychophysiological activity. It should be noted that we had
missing data for ETCO2 (n = 23; 7 HD, 5 ANX, 11
HC) due to equipment failure. For ETCO2, there were no
main effects of group, F (2, 64) = 1.47, p = .237,
η2p = 0.04 or task, F (1, 64) =
1.62, p = .208, η2p = 0.03 and
no interaction, F (2, 64) = 1.56, p = .219,
η2p = 0.05. For HRV, there were no
main effects of group, F (2, 82) = 1.15, p = .320,
η2p = 0.03 or task, F (1, 82) =
0.24, p = .625, η2p = 0.00 and
no interaction, F (2, 82) = 0.57, p = .566,
η2p = 0.01. For HR, there were no main
effects of group, F (2, 82) = 1.61, p = .206,
η2p = 0.04 or task, F (1, 82) =
1.26, p = .265, η2p = 0.02 and
no interaction, F (2, 82) = 0.15, p = .863,
η2p = 0.00.
We also had missing EDA data for 18 participants (4 HD, 8 ANX, 6 HC) due
to quality control issues. For SCL, there were no main effects of group,F (2, 69) = 1.06, p = .351,
η2p = 0.03 or task, F (1, 69) =
2.19, p = .143, η2p = 0.03 and
no interaction, F (2, 69) = 0.58, p = .562,
η2p = 0.02. Finally, for SCRs, there
were no main effects of group, F (2, 69) = 1.44, p = .244,
η2p = 0.04 or task, F (1, 69) =
1.62, p = .207, η2p = 0.02 and
no interaction, F (2, 69) = 0.43, p = .650,
η2p = 0.01.
Contrary to hypotheses, these findings indicate no differences in
psychophysiological activity among the groups or between the two tasks.
See Table 2 for means and standard deviations across groups.