Syntes: Suzuki & DeKeyser (2017) — 1-day vs 7-day gaps for practising Japanese verb forms

Källa: Suzuki, Y.; DeKeyser, R. (2017). Effects of distributed practice on the proceduralization of morphology. Language Teaching Research 21(2), 166–188. https://doi.org/10.1177/1362168815617334

Verified content

• [full text, author version] 40 learners of Japanese at a US university (mean age 21), randomly assigned to two practice sessions 1 day apart (n = 18) or 7 days apart (n = 22) on the Japanese -te form; tests right after, 7 days and 28 days later.
• [full text] Accuracy: no significant group effect (rule application F(1, 38) = 0.66, p = .42) or group × time interaction; the 1-day group scored higher at every posttest. Speed on sentence completion at 28 days favoured the 1-day group (whole group p = .08; subset of 29 current students p = .02, d = 1.01).

Limits

• [assessment] Small (N = 40); only two sessions; grammar; both groups spaced (no massed arm).

Why it is in the library

Found 2026-10-30 (nightly attacks) with Suzuki 2017 against C23's longer-gap clause; held as open question 20.

Added 2026-10-30 by the project. [full text] = read in the author version.