Frontal theta tACS yields strong memory advantages over all other stimulation conditions at 2-hour, 24-hour, and 1-week delayed free recall tests¶

Claim · All claims
Evidence · 1 study · causal r2 · q3 · i3 large
Currency · newest study 2024 · not yet checked against its sources · not reviewed by a person

Subclaims¶

q3 i3 Hedges' g effect sizes for the Theta Frontal group versus each other group exceeded 0.8 at every post-intervention assessment. → Limor Shtoots 2024

Evidence¶

Limor Shtoots 2024¶

Limor Shtoots, Asher Nadler, Roni Partouche, Dorin Sharir, Aryeh Rothstein, Liran Shati & Daniel A. Levy. (2024). Frontal midline theta transcranial alternating current stimulation enhances early consolidation of episodic memory. npj Science of Learning 9:8. https://doi.org/10.1038/s41539-024-00222-0

q3 · i3 · causal · r2

Between-group comparison of free recall at tests 4, 5, and 6 in the four-group tACS experiment. Table 1 prints Hedges' g values for Theta Frontal vs. Theta Parietal (0.85–0.98), vs. Beta Frontal (1.12–1.23), and vs. Sham (1.11–1.27), all above 0.8, while "comparisons between other conditions revealed much smaller effect sizes."

"Our results reveal a strong effect size (all values are above 0.8), while comparisons between other conditions revealed much smaller effect sizes (Table1)."

Discussion¶

Learner Variables¶

• Long-Term Memory — outcome: instruction changes it

Related Claims¶

• Post-intervention free recall shows a significant main effect of group favoring frontal theta stimulation, with no group × test interaction — related
• Frontal midline theta tACS applied after learning produces significant off-line retrieval gains at all assessment time points relative to beta, parietal theta, and sham conditions — related
• Baseline equivalence across stimulation groups rules out prior memory-ability differences as an explanation for post-intervention effects — related
• Participants were successfully blind to stimulation condition assignment across all four groups — related
• Sensations during stimulation did not differ across groups except for metallic/iron taste, which was lower in the Sham group than the Parietal Theta group — related