Language isolate
https://en.wikipedia.org/wiki/Language_isolate
Sign language
https://en.wikipedia.org/wiki/Sign_language
Nicaraguan Sign Language
https://en.wikipedia.org/wiki/Nicaraguan_Sign_Language
Lengua de señas nicaragüense
https://es.wikipedia.org/wiki/Lengua_de_se%C3%B1as_nicarag%C3%BCense
Deaf-community sign language
https://en.wikipedia.org/wiki/Deaf-community_sign_language
Home sign
https://en.wikipedia.org/wiki/Home_sign
Venezuelan Sign Language
https://en.wikipedia.org/wiki/Venezuelan_Sign_Language
Bamako Sign Language
https://en.wikipedia.org/wiki/Bamako_Sign_Language
Village sign language
https://en.wikipedia.org/wiki/Village_sign_language
Lengua de señas de Providencia
https://es.wikipedia.org/wiki/Lengua_de_se%C3%B1as_de_Providencia
Providence Island Sign Language
https://en.wikipedia.org/wiki/Providence_Island_Sign_Language
EMERGING SIGN LANGUAGES
http://sandlersignlab.haifa.ac.il/html/html_eng/pdf/EMERGING_SIGN_LANGUAGES.pdf
Language Isolates - Lonely Languages With No Family (Quick Video)
https://www.youtube.com/watch?v=lkubYrRQ1y8
Language deprivation experiments
https://en.wikipedia.org/wiki/Language_deprivation_experiments
Feral child
https://en.wikipedia.org/wiki/Feral_child
Language deprivation
https://en.wikipedia.org/wiki/Language_deprivation
Critical period hypothesis
https://en.wikipedia.org/wiki/Critical_period_hypothesis
Genie (feral child)
https://en.wikipedia.org/wiki/Genie_(feral_child)
Critical period
https://en.wikipedia.org/wiki/Critical_period
Concordancia gramatical
https://es.wikipedia.org/wiki/Concordancia_gramatical