At four months, babies can tell wheter a speaker has switched to a different language by using visual cues alone (speaker's mouth shape and rhythm, and face movements -according to a University of British Columbia study)
But the study found that eight-month-old babies were abe to rely on these visual cue alone if they were from bilingual homes.
These findings suggest that babies growing up in bilingual enviroments maintain the inborn ability to use visual cues to distinguish between multiple language (learn). Older infant exposed to only one language no longer need this ability, so their sensitivity to visual information declines.
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