Akzeleration (Schriftspracherwerb) ; Writing (precocious) ; Schrifterwerb (vorzeitiger) ; Lesenlernen (vorzeitiges) ; Reading/writing (precocious) ; Representation (of number) ; SNARC effect; Number (conception of) ; Case study (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