Effect of Mandarin Verb Network Strengthening Treatment (VNeST) in Mandarin-English bilinguals with aphasia: A single-case experimental design.
Ran Li, Wen Li, Swathi Kiran
PMID 32498670WHAT IT FOUND
Two bilinguals with aphasia trained in Mandarin verb retrieval showed gains in Mandarin and some transfer to English.
However, English gains faded to baseline one month later, and statistical significance was inconsistent. This pilot suggests potential but confirms no reliable long-term cross-language effect.
Key findings
01Training in Mandarin improved verb retrieval in Mandarin for both participants, with one showing large effect sizes and the other showing statistically significant improvements.
02There was evidence of cross-language generalization to English during treatment, but these gains were not maintained at the one-month follow-up for the participant with more severe aphasia.
03Participants showed reduced semantic errors over time, but one participant also exhibited an increase in cross-language errors and phonological errors in English.
STILL TO COME
How it was doneWhat they foundWhat it means for SLPs
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What it does not show
The study included only two participants, limiting generalizability. Statistical significance was not achieved for P1's primary outcomes, relying on effect sizes. P2's improvement in the control task suggests practice effects may have influenced results. Verb retrieval in Mandarin was not assessed with a standardized battery due to lack of instrumentation. The study did not include a comparison group or control treatment.
Declared interests
No conflicts of interest or funding sources were explicitly declared in the provided text.
The easy way to misread this
Do not assume that training in one language will produce lasting improvements in the other. In this study, cross-language gains in English disappeared at one-month follow-up for the patient with more severe aphasia, and statistical significance was not consistently found. Treat these findings as preliminary evidence of feasibility, not proof of efficacy for bilingual generalization.