[4] JSL's influence in TSL and KSL is largely due to Japan's colonial presence in both Korea and Taiwan respectively.
This means that although Japanese, Korean, and Taiwanese Mandarin are unrelated oral languages, someone who uses JSL can effectively communicate with someone who uses TSL or KSL with little difficulty.
Those using JSL, KSL and TSL are able to interact easily because of the commonalities they all share, such as grammatical features and functional markers.
[7] As in other sign languages, they incorporate nonmanual markers with lexical, syntactic, discourse, and affective functions.
These include brow raising and furrowing, frowning, head shaking and nodding, and leaning and shifting the torso.