Deliberate reasoning is not affected by language.

PLoS One · 2019 · PMC6355010 · PMID 30703137

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only marginally significantno p-value reported

There was a small positive correlation between second language proficiency and deliberate reasoning score, reaching significance only in the foreign language condition and being only marginally significant in the switching language condition.

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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.