Bimodal language acquisition; Language acquisition (sign language) ; Spracherwerb (Gebärdensprache) ; Sign language (language acquisition) ; Sprachpsychologie; Psycholinguistics ; Speech production (psycholing.) ; Kindersprache (pathol.) ; Child language (pathol.) ; Specific language impairment; SLI; Dysgrammatismus (Kindersprache) ; Dysgrammatism (child language) ; Handicapped language acquisition ; Kindersprache (Sprachverständnis) ; Children's comprehension of language; Language comprehension in children ; Taubheit; Deafness ; English