Three prominent theories of writing were found in a literature review of Psychlit, educational journals and Medline, and a fourth global theory relating writing to intact cerebral integrity was also hypothesized. These theories were then tested by attempting to predict writing scores among a sample of 44 individuals with academic difficulties. Significant support was found for a memory and attention model, the dysgraphia model, and an abstract sequential analysis model. Surprisingly, measures of the overall cortical integrity were not significantly related to writing behavior in this sample, but this finding may reflect excluding brain damaged subjects in this study. Also, the abstract sequential analysis model appeared to function differently than expected. The results indicate it is important to assess the cognitive contributions of writing difficulties to guide remediation. Larger scale research on the sources of writing disorders is also recommended.
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