Consciousness (cognitive science) ; Self-knowledge; Selbsterkenntnis; Self concept ; Simulation theory; Theory theory; Other minds ; Sprache und Denken; Erkenntnis und Sprache; Language and thought; Erkenntnistheorie; Epistemology and language; Language and epistemology ; Intentionality (pragm.) ; Shared intentionality; Collective intentionality; Intersubjectivity ; Semiotik (Theorie) ; Semiotic theory; Theory (semiot.) ; Soziokognition; Social cognition; Discursive psychology; Social psychology ; Intentionality (language acquisition) ; Play (function in 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