Cognitive science ; Error 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 ; Performanz; Performance; Knowledge (linguistic) ; Wissen (sprachliches) ; Competence/Performance ; Second language acquisition (psycholing.)