ASL; American Sign Language ; Bimodal language acquisition; Language acquisition (sign language) ; Spracherwerb (Gebärdensprache) ; Sign language (language acquisition) ; Gebärdensprache (psycholing.) ; Sign language (psycholing.) ; Gebärdensprache (neuroling.) ; Sign language (neuroling.) ; Speech production/speech perception (sign language) ; Number recognition; Zahlenerkennung; Zahlengedächtnis; Digit memory; Digit recognition ; Spracherwerb und neurologische Entwicklung; Language acquisition and neurological development; Sprache und Denken (Ontogenese) ; Language and thought (ontogenesis) ; Cognitive development; Language acquisition and cognitive development ; Kindersprache (Sprachgedächtnis) ; Children's verbal memory; Verbal memory in children ; Taubheit; Deafness ; English