For some people, sign language is the first language
Aliases: native signer · Deaf L1 · sign as first language
What it is
Some Deaf people acquire a sign language before — or instead of — a spoken or written one. Sign is L1. Written Chinese or English is then a second language, and fluency cannot be inferred from “the eyes can see print.” An interpreter track is speaking this person’s first language. It is not a decorative extra next to captions.
Why it happens
Acquisition has a critical period. People raised with sign at home, in a Deaf community or a Deaf school, think and talk in sign by default. Literacy inside the Deaf population varies widely: some are strong bilinguals; some struggle with long print. Design that assumes “deaf means write the sound down” misses the slice whose L1 is sign and whose written language is weaker.
Hearing loss is not one group. People deafened later, hard of hearing, or raised in oral programmes may still have a spoken or written L1; sign is not their default. Drawing every deaf user as one persona overestimates how far captions cover L1 signers, and how far sign covers print-dominant users. Personas have to split language history, not only mark “hearing.”
Studying it
Recruit by language background first: sign L1, later-deafened with written L1, hard of hearing and speech-dominant. Compare interpreter video against print on the same content, and report by group. Pooling washes the effect out.
Independent variables: medium (signed video / print), participant L1. Dependent variables: comprehension accuracy, time on task, reported effort.
Pay people and recruit through community channels. Hearing colleagues who “know a few signs” are not L1 stand-ins.
Where it stops holding
Child and adult L1 status differ; adult bilingual performance does not design content for signing school-age children. L1 in one sign language is not L1 in another — a CSL user does not read an ASL track and may still need their own language. Highly literate Deaf people may still prefer sign; preference is not a deficit. Hearing people who happen to be muted are not sign L1; the signed track is not for them.
Applying it
- For public-service, education and clinical video that decides rights or risk, assess whether an interpreter track in the regional sign language is needed — captions alone are not the assessment.
- Do not write personas as a single “deaf users need captions.” Split at least sign L1 from print-dominant.
- How to check: sign-L1 participants watch the interpreter track with print captions off and complete the comprehension task on their own. If they cannot, the product is still using a second language as the only channel.