Signed Languages in Co-Existence With Germanic Languages: A Typological Perspective
Authors: Vermeerbergen Myriam , Engberg-Pedersen Elisabeth 
Published: September 2024

Human natural languages come in two forms: spoken languages and signed languages, which are the visual-gestural languages used mainly by Deaf communities. Modern signed language linguistics only began around 1960. Studies have shown that signed languages share similarities with spoken languages at all levels of linguistic description, but that modality—whether vocal-auditory or visual-gestural—plays a role in some of the differences between spoken and signed languages. For example, signed languages show a more simultaneous organization than spoken languages, and iconicity and the use of space play a more important role. The study of signed languages is therefore an important addition to our knowledge of human language in general. Based on the research already carried out, it seems that different signed languages are structurally more similar to each other than different spoken languages. The striking similarities between signed languages have been attributed to several factors, including the affordances of the visual-gestural modality. However, more recent research has also shown differences between signed languages. Some of these may be due to independent diachronic changes in individual signed languages, others to influences from spoken languages. Indeed, for most signed languages there is an intensive contact with at least one, and sometimes several, spoken languages, which undoubtedly influence the signed languages, especially at the lexical level. However, the influence, whether lexical or grammatical, has been explored to a limited extent. It is particularly interesting to examine the extent to which unrelated signed languages are similar and different, and whether contact with the surrounding spoken languages plays a role in this.

Danish Sign Language and Flemish Sign Language are two signed languages that are not related. By contrast, Danish and Dutch both belong to the Germanic language family, Danish as a North Germanic language, Dutch as a West Germanic language. Some of the features shared by the two signed languages can be explained as modality dependent: they both use spatial morphology to express agreement and complex verbs of motion and location, and both use nonmanual features, that is, facial expression, gaze direction, and head movement, to express, for instance, topicalization and clause boundaries. Other shared features may not be explained as modality dependent in any straightforward way; this is the case with their preference for sentence-final repetition of pronouns and verbs. Moreover, the two signed languages share features that distinguish them from most Germanic languages: they lack a clear subject category and prototypical passive constructions, and they do not have V2-organization with the finite verb in the second position of declarative clauses. Much more research, especially research based on large annotated corpora, is needed to clarify the reasons why unrelated signed languages share many grammatical features, and the influences from spoken languages on signed languages.