Gesture communication ; Referring (conversational analysis) ; Reference (conversational analysis) ; Iconicism ; Spracherwerb (pragm.) ; Communicative competence (language acquisition) ; Kommunikative Kompetenz (Spracherwerb) ; Pragmatic competence (language acquisition) ; Pragmatische Kompetenz (Spracherwerb) ; Conversational analysis (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 ; Kindersprache (Sprachverständnis) ; Children's comprehension of language; Language comprehension in children ; Symbol (language acquisition) ; Arbitrariness