Deaf education; Einsprachige Methode (Gehörlosenunterricht) ; German method (Deaf education) ; Deutsche Methode (Gehörlosigkeit) ; Monolingual method (Deaf education) ; Simulation theory; Theory theory; Other minds ; Kindersprache (pathol.) ; Child language (pathol.) ; Specific language impairment; SLI; Dysgrammatismus (Kindersprache) ; Dysgrammatism (child language) ; Handicapped language acquisition ; Mental representation (language acquisition) ; Object individuation; Conceptual development; Konzept (Spracherwerb) ; Concept formation ; Spracherwerb und neurologische Entwicklung; Language acquisition and neurological development; Sprache und Denken (Ontogenese) ; Language and thought (ontogenesis) ; Cognitive development; Language acquisition and cognitive development ; Taubheit; Deafness ; French