Napping reduces forgetting only for items learned by retrieval practice without feedback, not for restudied or feedback-retrieved items¶

Claim · All claims
Evidence · 1 study · causal r1 · q2
Currency · newest study 2025 · not yet checked against its sources · not reviewed by a person

Subclaims¶

q2 i? In a nap-vs-wake experiment, the nap group showed significantly lower recall change rates (less forgetting) than the wake group only under retrieval practice without feedback; no significant differences appeared under restudy or feedback retrieval. → Jing Zhang 2025

Evidence¶

Jing Zhang 2025¶

Jing Zhang, Xiaoning Huo, Hongbo Lv, Jiahua Xu & Xiaofeng Ma. (2025). Offline consolidation mechanisms of the retrieval practice effect: an analysis based on EEG signal characteristics. npj Science of Learning. https://doi.org/10.1038/s41539-025-00349-8

q2 · i? · causal · r1

Behavioral repeated-measures ANOVA of the recall change rate (delayed minus immediate over immediate) in the 48-participant nap/wake experiment; the simple-effect analysis showed "the nap group showing lower rates than the wake group" only for no-feedback retrieval practice (p < 0.001).

"only under the retrieval practice without feedback condition were there significant differences in word pair recall change rates between the nap and wake groups (p < 0.001), with the nap group showing lower rates than the wake group"

Discussion¶

Related Claims¶

• Nap benefits for no-feedback retrieval-practice items appear at both 90-minute immediate and 24-hour delayed tests — related
• Wake groups show greater recall-change differences between learning conditions than nap groups, driven by no-feedback items — related
• Exploratory analysis finds moderate-magnitude correlation between central fast spindle density and retention of no-feedback retrieval-practice items — related
• Exploratory analysis finds moderate-magnitude correlation between fast spindle-slow oscillation coupling strength and retention of no-feedback retrieval-practice items — related