ASL; American Sign Language ; Gebärdensprache (psycholing.) ; Sign language (psycholing.) ; Gebärdensprache (neuroling.) ; Sign language (neuroling.) ; Speech production/speech perception (sign language) ; Gebärdensprache (Zweitspracherwerb) ; Sign language (second language acquisition) ; Sign language (language teaching) ; Gebärdensprache (Sprachunterricht) ; Second language acquisition (sign language) ; Critical period (second language acquisition) ; Alter (Einfluss auf Zweitspracherwerb) ; Age (influence on second language acquisition) ; Ultimate attainment (second language acquisition) ; Near-native competence (second language acquisition) ; AoA; Age of acquisition (second language acquisition) ; Sensitive period (second language acquisition)