Medical practitioners all over the world have conducted several studies on dyslexia brain patterns and structure to identify some possible causes of the disorder. The different experiments conducted have always used a control group of non dyslexic people whose brain patterns, structure and functions have been matched with a group of dyslexic people to sort out the differences. When you see the different sets of data and observations under varied testing conditions, you can attribute four major changes in the brain that might be the early signs of dyslexia in people. It is important to know the changes or factors that have a prominent effect on the development of the disorder.
Less White Matter In Left Parietotemporal Area:
The first major change that has been observed while working on dyslexia brain patterns is that dyslexic people have a lot less white matter in the left parietotemporal area of the brain as compared to their non dyslexic counterparts. The white matter is associated with increased reading skills which can explain the inability of persons to approach and process oral passages during their academic careers. The dyslexia brain tests have also revealed that lesser white matter leads to a restriction in communication efficiency between various regions of the brain that can lead to multiple other problems.
No Activity In V5/MT Brain Area:
A lot of dyslexia brain studies are related to the visual components and how they can provide changes to the disorder for specific individuals. The usual moving dots tests conducted on the control as well as dyslexic group have come up with a specific set of results. Normal participants showed robust activity in the V5/MT brain area that is linked to the visual cortex. Dyslexia patients did not show any activity in that specified region. This particular dyslexia brain mapping activity can confirm how visual impairments might lead to incomplete information being sent to the brain that can lead to dyslexic conditions.
Contrasting Results For Regional Cerebral Blood Flow (rCBF):
Among the various dyslexia brain activity tests conducted among dyslexic and non dyslexic people, the rCBF test is the one that has produced contrasting results. For the control group, higher rCBF equates to better reading skills but the pattern is reversed for dyslexics where higher rCBF means worsening reading skills. This can lead to the conclusion that the left hemisphere dynamics of the dyslexic people are diametrically opposite than the control group. Normal people in dyslexia brain studies perform better with stronger left hemisphere activity but the condition worsens for individuals with dyslexia.
Ectopia And Symmetry In Cerebral Cortex:
Ectopias are small branches of neurons and axons used in dyslexia brain studies that are responsible for language functions and reading proficiency. They make the seasonal migration to the cortex during the birth of a newborn. However, in the case of dyslexics, it has been observed that many ectopias show up in foreign locations beyond the cortex and get altered affecting brain functions. This also confirms one of the theories that dyslexia is cognitive as the ectopia is related to family history. The planum temporale is the same size on both hemispheres in dyslexic people indicating that the dyslexia brain is a lot more symmetrical as compared to their normal counterparts.
Brain structural and functional differences are primarily responsible for an alteration in normal conditions that can lead to the development of primary stages of dyslexia. Scientific studies and researches that are conducted on the dyslexia brain might find out areas of incompatibility but a lot of depth is required for the analysis that can help unlock the true secrets of the disorder.
What is Dyslexia