The neuropsychology of writing and spelling: semantic, phonological, motor, and perceptual processes

Neuropsychological data is reviewed in order to delineate the semantic, phonological, motor, and perceptual processes underlying spelling, with particular attention to handwriting. These data support a model in which semantic, lexical phonological, and non-lexical phonological processes can generate spelling, either independently or in an interactive fashion. Oral and written spelling depend upon common processes up to, and including, an orthographic code. After this point they each depend upon several separate stages of information processing.