PPVT; Echelle de vocabulaire en images Peabody; EVIP; Test de Vocabulario en Imagenes Peabody; TVIP ; ASL; American Sign Language ; Bimodal language acquisition; Language acquisition (sign language) ; Spracherwerb (Gebärdensprache) ; Sign language (language acquisition) ; Iconicism ; Spracherwerb (lex.) ; Language acquisition (lex.) ; Vocabulary (language acquisition) ; Zweitspracherwerb (lex.) ; Second language acquisition (lex.) ; Vocabulary (second language acquisition)