Adult ASL-fluent participants significantly improved STEM test scores by about 22% after watching four-to-six-minute ASL video lessons¶

Claim · All claims
Evidence · 1 study · causal r1 · q3
Currency · newest study 2026 · not yet checked against its sources · not reviewed by a person

Subclaims¶

q3 i? Participants' scores improved significantly from pre-test to post-test after the video lessons, with a predicted 22% improvement (1.76 points). → Rachel Sortino 2026

Evidence¶

Rachel Sortino 2026¶

Rachel Sortino, Christina Kim, Thalia Guettler, Katie McClyman, Lorna Quandt, Alicia Wooten & Rachel Pizzie. (2026). Producing concept-motivated signs supports learning of STEM content in American Sign Language. npj Science of Learning 11:37. https://doi.org/10.1038/s41539-026-00418-6

q3 · i? · causal · r1

In-lab within-participant experiment (N = 30) with pre-test, video learning phase, and post-test across four STEM topics. A linear mixed-effects model showed a significant effect of time; the article reports "a 22% improvement (1.76 points) from pre to post-test".

"We found a significant effect of time on test scores ( X2(3) = 125.01, p < .001) while accounting for variability attributedto test topic and individual differences between participants. This model predicted a 22% improvement (1.76 points) from pre to post-test ( β = 1.762, t(206) =−11.18)."

Discussion¶

Related Claims¶

• Learning from concept-motivated versus English-motivated ASL lessons showed no significant difference in pre-to-post score gains — related
• Producing more concept-motivated signs in signed summaries predicted higher test scores, especially post-test, while English-motivated sign use did not — related
• Expert reviewers rated concept-motivated and English-motivated ASL lesson pairs as approximately equally clear, enjoyable, and frustrating — related
• Brief signed video lessons produced learning gains, but the study could not rule out practice effects because it lacked a no-training control group — possibly the same claim (merge candidate)