Sign language ; ASL; American Sign Language ; Bimodal language acquisition; Language acquisition (sign language) ; Spracherwerb (Gebärdensprache) ; Sign language (language acquisition) ; Sentence processing; Language processing; Language comprehension ; Syntactic development; Morphological development; Morphologie (Spracherwerb) ; Syntax (Spracherwerb) ; Grammatical development ; Critical period (language acquisition) ; Alter (Einfluss auf Spracherwerb) ; Age (influence on language acquisition) ; Age of acquisition; AoA; Sensitive period (language acquisition)