EEG functional-connectivity classification models of CRA correctness differ by tDCS group and frequency band, with alpha-band models underperforming beta-band models specifically in the L+R− group¶

Claim · All claims
Evidence · 1 study (2 entries) · causal r2 · q3
Currency · newest study 2024 · not yet checked against its sources · not reviewed by a person

Subclaims¶

q3 i? Group and frequency band exert significant effects on classification AUC. → Xie 2024 q3 i? Within the L+R− group, alpha-band models significantly underperform beta-band models. → Xie 2024 (2)

Evidence¶

Xie 2024¶

Xie, C., Zhang, S., Qiao, X., & Hao, N. (2024). Transcranial direct current stimulation targeting the bilateral IFG alters cognitive processes during creative ideation. npj Science of Learning, 9, 75. https://doi.org/10.1038/s41539-024-00285-z

q3 · i? · causal · r2

Two-way ANOVA over 480 nested-ensemble classification models (80 per group per band) built from task-related phase-locking connectivity; the quote reports the significant group and band effects on AUC, with the group×band interaction approaching significance (F2,474 = 2.68, p = 0.07).

"According to the ANOVA results presented in Fig.2a, both the group factor ( F2,474 = 24.64, p < 0.001, ηp 2 = 0.094) and the frequency band (F1,474 = 31.68, p < 0.001, ηp 2 = 0.063) exerted significant effects on AUC"

Xie 2024 (2)¶

Xie, C., Zhang, S., Qiao, X., & Hao, N. (2024). Transcranial direct current stimulation targeting the bilateral IFG alters cognitive processes during creative ideation. npj Science of Learning, 9, 75. https://doi.org/10.1038/s41539-024-00285-z

q3 · i? · causal · r?

Post-hoc comparison within the L+R− group of model AUCs; the authors report alpha-band models "under- performed compared to those based on beta band data" (t474 = −5.08, Bonferroni-corrected p < 0.001), attributing overall model-performance differences to variance within this group.

"it was observed that specifically in the L+R− group, models based on alpha band data significantly under- performed compared to those based on beta band data"

Discussion¶

Related Claims¶

• Frontal lateralization of classification-model activity differs by tDCS group: reversed (left-dominant) alpha-band lateralization after L+R− and reduced left prefrontal beta-band engagement after L−R+ — related
• The relationship between RSD and CRA reaction time differs by tDCS group: U-shaped under Sham, monotonically decreasing under L−R+, and no clear relationship under L+R− — related
• tDCS over the bilateral IFG does not change overall CRA convergent-thinking performance compared across stimulation groups — related
• HD-tDCS facilitated and enhanced training-induced increases in frontal task-related theta, alpha, beta, and gamma power — related