Types of dyslexia include phonological dyslexia, orthographic dyslexia, dyscalculia and dysgraphia, all of which present difficulties in different areas of speech and reading. Learn about the different types of dyslexia from a recognized scholar of dyslexia treatment in this free video on learning disabilities. Expert: Dr. Diane Sawyer Contact: dyslexia.mtsu.edu Bio: Dr. Diane J. Sawyer is the holder of the Chair of Excellence in Dyslexic Studies and an internationally recognized scholar in the field of reading. Filmmaker: Dimitri LaBarge