Study finds no clear ERP memory differences across emotional contexts

A study published in BMC Psychology examined whether preceding positive emotional contexts, differing in arousal levels, were associated with subsequent-memory event-related potential (ERP) differences for independently presented neutral words. Candidate-window-corrected analyses did not provide clear evidence that subsequent-memory ERP contrasts differed across contexts.

The study involved thirty-two participants who completed a three-context, within-participant study-recognition task. Of these, twenty-seven contributed to the primary ERP analyses. Each study block used one picture-context category, and block order varied. However, the word-list roles and context assignments were fixed throughout the experimental procedure. Words appeared 400 milliseconds after picture offset.

The methodological approach included the analysis of recognition data, effective-response signal-detection indices, and supplementary total-trial-denominator indices. The team also measured correct reaction times and encoding ERPs within specific time windows, specifically 120–170 milliseconds and 400–600 milliseconds. Additionally, retrieval-related FN400 and late positive component (LPC) effects were examined. An encoding sensitivity analysis compared hits with explicit misses, excluding no-response trials.

In the 400–600 millisecond frontocentral window, the interaction between context and subsequent memory was found to be nonsignificant after Holm correction across seven candidate encoding windows. This lack of significance was observed in both the primary analysis, with a p-value of 0.089, and the explicit-miss sensitivity analysis, which yielded a p-value of 0.051.

These contrasts yielded a larger positive low-arousal subsequent-memory difference, or DM, compared to the high-arousal and neutral DMs. The within-window Holm-adjusted p-values for these comparisons were 0.031 and 0.040, respectively. A similar pattern was observed in the explicit-miss sensitivity analysis.

Behavioral measures did not reveal reliable context differences. Effective-response signal-detection indices, outcome-level recognition rates, and reaction times all showed no significant variations across the different emotional contexts.

During the retrieval phase, an FN400 effect was detected across all contexts. However, the study found nonsignificant context modulation of this effect, as well as nonsignificant LPC effects.

The authors conclude that while the exploratory 400–600 millisecond estimates suggested a larger positive low-arousal contrast, this finding was not accompanied by a detected behavioral memory advantage. The study highlights the importance of prospectively specified replication with counterbalanced word-list roles and context assignments to further investigate these potential effects.

Subject of Research: Neural correlates of memory encoding under varying emotional contexts

Article Title: Preceding positive emotional contexts and subsequent-memory ERP differences for neutral words

Article References: Guo, X., Zhao, Q., Ma, H., & Wang, H. (2026). Preceding positive emotional contexts and subsequent-memory ERP differences for neutral words. BMC Psychology. https://doi.org/10.1186/s40359-026-05882-8

Image Credits: AI Generated

DOI: 10.1186/s40359-026-05882-8

Keywords: ERP, Memory, Emotion, Cognitive Neuroscience, Subsequent Memory, FN400, BMC Psychology, Within-Participant Design, Signal Detection, Arousal, Preceding, positive