Sprache und Denken; Language and thought; Sprachliches Relativitätsprinzip; Denken und Sprache; Relativity (linguistic) ; Wahrnehmung und Sprache; Perception and language; Sapir-Whorf hypothesis; Linguistic relativity ; Language and thought (speech production) ; Kulturvergleich; Language and culture ; Erstspracherwerb; First language acquisition; Ontogenese; 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 ; Second language acquisition (psycholing.) ; German ; Persisch; Neupersisch; Persian