Self-knowledge; Selbsterkenntnis; Self concept ; Erstspracherwerb; First language acquisition; Ontogenese; Language acquisition ; Anaphora (Spracherwerb) ; Reference (language acquisition) ; Spracherwerb und neurologische Entwicklung; Language acquisition and neurological development; Sprache und Denken (Ontogenese) ; Language and thought (ontogenesis) ; Cognitive development; Language acquisition and cognitive development ; Personal pronoun ; French