Causes of Dyslexia
Dyslexia is caused due to impairment in the brainís ability to translate images received from the eyes or ears into understandable language.
It has been proved that the brain of a dyslexic person develops differently from that of others. Studies have shown that the inborn wiring system of the brain related to developing mental skills is different in dyslexics and this is the base cause of dyslexia.
The wiring system of the brain or the neural pathway is the process that codes the information the sensory organs receive and stores it in the brain for future assimilation. This information is later used to assess situations and develop response patterns to the situations, increase the muscular co-ordinations according to the situations, or even help us in understanding and comprehending the constant inputs our brain is getting in terms of everyday activities, school procedures etc.
In a dyslexic child, even these minor acts of comprehension and usage may take a lot more time and skill than a normal child.
Hence, one school of thought has concluded that dyslexia is a condition that is largely inborn and not the result of poor parenting or environment.
However, another school of researchers strongly disagree and believe that while dyslexia may sometimes be inborn, it is often due to lack of phonics training while learning to read and the preponderance of the whole language system.
In one of the theories about dyslexia, researchers Geschwind and Galaburda had suggested a link between raised testosterone levels in pregnant mothers during the first trimester that may lead to a variant brain structure, and dyslexia.
In other studies, dyslexia had been linked to genetic reasons. According to research conducted by M. M. Nothen and others, the inability to learn spellings can be linked to a gene called 15q21 of chromosome 15.