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Mean percentage of errors in spelling different types of stimuli as a function of age in English (upper part) and Italian (bottom part) children. (A) Shows the children performance in spelling non-words, low frequency words and high frequency words; (B) represents the performance in spelling regular and irregular words. Lf, low frequency; hf, high frequency. L4, L5, L6, and L7–9 indicate respectively 4-, 5-, 6-, and 7–9- letters stimuli.
