Signed languages - Unique and ordinary: A commentary on Kidd and Garcia (2022)

In this commentary on the article by Kidd and Garcia, we point out that research on natural signed languages is an important component of the goal of broadening the database of knowledge about how languages are acquired. While signed languages do display some modality effects, they also have many similarities to spoken languages, both in function and in form. Thus, research on signed languages and their acquisition is important for a fuller understanding of the diversity of languages. Since signed languages are often learned in contexts other than those of typical input, it is also important to document the effects of input variation; we also see it as critical that input be provided as early as possible from models as fluent as possible. Finally, we call for removing existing barriers to training and education for would-be researchers, especially those interested in working on signed languages. Importantly, we advocate for the recognition of signed languages, for signed language research, and for the empowerment of community members to lead this research.