Table 2:
Mixed ANOVA for ERSP of each frequency band and theta ITPC
| df | F | p | ηp2 | Post-hoc | |
|---|---|---|---|---|---|
| ERSP THETA | |||||
| Group (HC, SZ) | 1, 60 | 18.30 | <0.001 | 0.20 | HC > SZ |
| Site (P7, P8, Fz) | 2, 120 | 10.66 | <0.001 | 0.02 | P8 > P7/Fz |
| Group × Site | 2, 120 | 2.10 | 0.127 | 0.00 | -- |
| ERSP ALPHA suppression | |||||
| Group (HC, SZ) | 1, 60 | 1.40 | 0.242 | 0.02 | -- |
| Site (P7, P8, Fz) | 2, 120 | 60.26 | <0.001 | 0.06 | P8 > P7 > Fz |
| Group × Site | 2, 120 | 1.90 | 0.231 | 0.00 | -- |
| ERSP BETA suppression | |||||
| Group (HC, SZ) | 1, 60 | 12.12 | 0.001 | 0.12 | HC > SZ |
| Site (P7, P8, Fz) | 2, 120 | 12.09 | <0.001 | 0.05 | P8 > P7/Fz |
| Group × Site | 2, 120 | 3.29 | 0.041 | 0.01 | HC > SZ* |
| ERSP GAMMA suppression | |||||
| Group (HC, SZ) | 1, 60 | 4.08 | 0.072 | 0.04 | -- |
| Site (P7, P8, Fz) | 2, 120 | 11.60 | <0.001 | 0.07 | Fz > P7/P8 |
| Group × Site | 2, 120 | 0.77 | 0.466 | 0.01 | -- |
| ITPC THETA | |||||
| Group (HC, SZ) | 1, 60 | 18.55 | <0.001 | 0.18 | HC > SZ |
| Site (P7, P8, Fz) | 2, 120 | 50.02 | <0.001 | 0.12 | P8 > P7 > Fz |
| Group × Site | 2, 120 | 0.08 | 0.924 | 0.00 | -- |
Note. Post-hoc tests were conducted using Tukey HSD.
*
For beta ERSP, there was a significant Group × Site interaction, where HC showed a pattern of greater beta suppression at P8 relative to P7/Fz, but this pattern was weaker in SZ than HC.
ERSP = event-related spectral perturbation. ITPC = inter-trial phase consistency.
HC = healthy control. SZ = schizophrenia.
False Discovery Rate (FDR) correction (p<0.05) was applied to each ANOVA.