Purpose: Readers can draw on their knowledge of sound-to-letter mappings to form expectations about the spellings of known spoken words prior to seeing them in written sentences. The current study asked whether such orthographic expectancies are observed in the absence of contextual support at the point of reading. Method: Seventy-eight adults…

We develop and test a dual-route model of genetic effects on reading aloud and spelling, based on irregular and non-word reading and spelling performance assessed in 1382 monozygotic and dizygotic twins. As in earlier research, most of the variance in reading was due to genetic effects. However, there were three more specific conclusions: the…