I understand multiple spoken languages. If I hear someone speak (or see a writing in) English, I recognize that it's English not Latvian and interpret the sounds (or letters) as it's appropriate for the English language.
Is that just as easy in sign languages? If a signer understands multiple sign languages (for example, ASL and Russian SL), can they nearly instantly recognize which one is used by someone else?
Or could they misunderstand which language is used and think that some unknown signs are being shown until few sentences in?
And can some signers identify some other sign languages that they don't know themselves? In spoken languages it's possible - don't understand French or Italian, but I can somewhat recognize these languages by sounds and flow when I hear them. Can ASL signers similarly see Dutch SL or BSL and understand that it's being used without knowing that language themselves?
The reason for asking is that I am learning ASL instead of the local sign language due to accessibility of learning material. I wonder if signers will be able to identify it.