Research has been done to suggest that two more areas/systems of the brain are involved in reading. They are the left parietotemporal system and the left occipitotemporal area. The left parietotemporal system is used for effortful decoding and word analysis. While, the left occipitotemporal area is used for rapid access of words. These areas are important for understanding spoken and written language as well as being able to read fluently and effectively.
Brain Differences in People With and Without Dyslexia
A study done by Booth and Burman found that people with dyslexia have less gray matter in their parietotemporal lobe than people without dyslexia. Since gray matter aids in processing information this can cause a problem in precessing speed and the ability to process important information. They also found that there was less white matter in this area as well. White matter corresponds with reading skill, less white matter can cause deficiencies in the abilities to communicate with other parts of the brain for reading. A different study by Heim and Keil showed that people with dyslexia have a more symetrical brain structure while people without dyslexia have an asymmetrical brain structure. For example, people without dyslexia their left side or hemisphere of the brain is larger than the right. People with dyslexia their brain hemispheres are the same on each side or the right is slightly bigger.
Brain Functions of People With and Without Dyslexia