Representation (of number) ; SNARC effect; Number (conception of) ; Finger counting ; Spracherwerb und neurologische Entwicklung; Language acquisition and neurological development; Sprache und Denken (Ontogenese) ; Language and thought (ontogenesis) ; Cognitive development; Language acquisition and cognitive development ; Taubheit; Deafness ; Digit; Ziffer; Zahlbezeichnung; Numeral (symbol)