Syntes: Wesenberg et al. (2026) — seductive details: the transfer harm disappears when the extras are boxed as a separate topic

Källa: Wesenberg, L., Krieglstein, F., Jansen, S., Schneider, S., & Rey, G. D. (2026). Mitigating the seductive details effect by topic and irrelevance signals. British Journal of Educational Psychology, 96, 382–400 (published online 21 August 2025). https://doi.org/10.1111/bjep.70022

Verified numbers (full text read 2026-10-13, open access)

• Sample: 215 recruited via Prolific, 195 analysed (exclusions for note-taking, unauthorised aids, an outlier, failed attention checks); German-speaking students resident in Germany; mean age 24.95 (SD 4.36); 46.2 % undergraduate, 19.5 % graduate, 3.6 % doctoral, 23.6 % secondary school. A priori power analysis: N = 179.
• Material: self-paced 461-word text on how coral reefs form; five interesting but irrelevant paragraphs (37–56 words) on the uses and benefits of corals, rated more interesting than the core text in a pretest.
• Groups: no extras (45); unmarked extras woven into the text (49); the same extras in grey boxes, announced beforehand as a separate topic (topic signals, 49); boxes announced as a separate topic and as irrelevant for the test (52).
• Transfer (six open questions, max 6; adjusted means, Table 3): 2.90, 1.82, 2.96, 2.40. ANCOVA F(3, 189) = 6.42, p < .001. Unmarked vs none p < .001, d = .74; topic signals vs unmarked p < .001, d = −.79; Bayesian no extras vs topic signals BF01 = 4.57; irrelevance added to topic signals p = .055, d = .39 (direction: lower).
• Retention: no group differences (F(3, 189) = 1.23, p = .301).
• Interest: higher with extras (p = .009, d = −.54); interest partly mediated better retention and transfer. Self-reported extraneous load did not differ.
• Authors: a first finding that "needs replication before reliable, practical recommendations can be made"; limits include an online sample, one text and an immediate test.
• Reported, not read: a separation prompt did not reduce the harm in Kienitz, Krebs & Eitel 2023; relevance/irrelevance signals removed it in Eitel, Bender & Renkl 2019, Kienitz et al. 2023 and Bender, Renkl & Eitel 2021.

Role for C8

Limits (weaken, 2026-10-13): the transfer harm is shown for extras woven into the material; in this experiment the same extras, set apart and announced as a separate topic, did not lower transfer. The unmarked condition reproduced the harm, so the average claim stands.