This paper urges a deeper consideration of the role of psychometrically defined intelligence in the operationalization of aptitude/achievement discrepancies inherent in most definitions of learning disability. It proposes a new disability, dysrationalia, the inability to think and behave rationally despite adequate intelligence. (DB)

This commentary supports Linda Siegel's challenge to the learning disabilities field (in EC221505) to produce data indicating that dyslexic readers differ from other poor readers in their cognitive processing, educational prognosis, and response to treatment. The commentary also points out that the existence of Matthew effects reinforces Siegel's…