Very similar spacing-effect patterns in very different learning/practice domains.

PLoS One · 2014 · PMC3946552 · PMID 24609081

Europe PMC DOI

hedged sentence

—

closest p

—

boldest claim

The sentences

highly significantno p-value reported

For both the vocabulary learning and visual acuity performance we found a highly significant effect of the factor spacing interval on the final test performance.

also in 132,142 other papers

Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.