Early and Accessible is More Important than Perfect: What New Research Tells Us About Deaf Children Learning to Sign from Hearing Families

When a deaf or hard-of-hearing child first arrives in a hearing family, caregivers are faced with decisions they probably never anticipated. One of the most pressing is which language(s) to use with their child, and how soon to introduce that language? For families who choose to learn ASL alongside their child, a new study offers evidence that their effort can make a real difference for their child, even before their own signing is fluent.

Published in Developmental Science, "Mechanisms of Vocabulary Acquisition Persist Under Variable Language Experience" is a study by researchers Amelia Becker, Jennie Pyers, and Naomi Caselli from Boston University's Deaf Center and Wellesley College. They compared how deaf children with deaf signing caregivers and deaf children with hearing caregivers — most of whom were novice signers — built their early ASL vocabularies. More than 230 children from across the United States and Canada were included in the study.

Like the researchers expected, children with hearing caregivers had smaller ASL vocabularies. Language gaps linked to delayed or inconsistent exposure are well documented, and this study didn't contradict that. But the more interesting finding was how the two groups of children were the same. When researchers compared not only how many signs each group knew but which kinds of signs children were learning, the two groups were remarkably similar. This is important because the order in which children learn signs reflects the patterns they are tracking in the language around them, and that pattern recognition reveals the cognitive skills that drive their learning. Because children learned signs in the same systematic, patterned ways, regardless of who was signing to them, the researchers concluded that the same underlying cognitive mechanisms were at work in both groups.

"The composition of children's early vocabularies was remarkably similar between the two groups, despite their disparate language experiences."

This finding challenges a subtle but damaging assumption that variable or imperfect early language exposure doesn't just slow development down but warps it. This study suggests the opposite: when exposed to accessible language, even when that language isn’t perfectly fluent, deaf children's brains do what they are built to do.

The gap in vocabulary size still deserves attention. The researchers were careful to note that early exposure is critical, and that the sooner signing begins, the better children’s outcomes tend to be. In particular, children with hearing caregivers in this study were slower to learn less common signs, probably because they saw these signs less frequently. Broadening a child's exposure to fluent signers and the wider Deaf community can help fill in gaps in their language exposure at home. But families learning to sign alongside their child are not failing them. They are giving their child's language system something to work with, and that system, it turns out, is resilient.

Share this information with a family learning to sign with their deaf or hard-of-hearing child. Their efforts matter, and they are supporting their child's healthy development!