The problem of incomplete language acquisition and heritage languages is approached from several perspectives: who are heritage speakers, how are they different from native speakers and L2 learners, is heritage language a particular system? This paper aims at answering these and other questions...

While spoken languages primarily make use of the acoustic-auditory modality, sign languages use visual-gestural modality. This results in structural differences between those languages. Sign language properties are especially intriguing due to three domains used to convey linguistic information:...