Cognitive science ; Simulation theory; Theory theory; Other minds ; Longitudinal study ; Deklaratives Gedächtnis; Declarative memory; Gedächtnis (prozedurales) ; Memory (procedural) ; Procedural memory ; Spracherwerb und neurologische Entwicklung; Language acquisition and neurological development; Sprache und Denken (Ontogenese) ; Language and thought (ontogenesis) ; Cognitive development; Language acquisition and cognitive development ; Sozioemotionale Entwicklung; Socioemotional development; Language acquisition and psychological development ; German