All of us raising multilingual children know this. Find out more at https://www.princeton.edu/news/2017/08/07/bilingual-babies-listen-languages-and-dont-get-confused.
Lew-Williams suggests that this study not only confirms that bilingual infants monitor and control their languages while listening to the simplest of sentences, but also provides a likely explanation of why bilinguals show cognitive advantages across the lifespan. Children and adults who have dual-language proficiency have been observed to perform better in “tasks that require switching or the inhibiting of a previously learned response,” Lew-Williams said.
Read “Real talk. For decades, the idea of a language instinct has dominated linguistics. It is simple, powerful and completely wrong” at https://aeon.co/essays/the-evidence-is-in-there-is-no-language-instinct for answers
Interested in brain research? Read more here after the excerpt:
To address this question, Dr. Berent and her colleagues examined the response of human brains to distinct syllable types — either ones that are frequent across languages (e.g., blif, bnif), or infrequent (e.g., bdif, lbif). In the experiment, participants heard one auditory stimulus at a time (e.g., lbif), and were then asked to determine whether the stimulus includes one syllable or two while their brain was simultaneously imaged.
Results showed the syllables that were infrequent and ill-formed, as determined by their linguistic structure, were harder for people to process. Remarkably, a similar pattern emerged in participants’ brain responses: worse-formed syllables (e.g., lbif) exerted different demands on the brain than syllables that are well-formed (e.g., blif).
Good to know the current research about first langiage acquisition