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Causes of Dyslexia – What Do We Know About It?
November 7th, 2009 by admin
As much as one person in each 10 has some kind of dyslexia. Dyslexia is a condition marked by difficulties of processing visual data. It results in Problems with reading and with processing certain types of visible information. analysts now believe that, at base, dyslexia is a neuronal migration disorder that has an effect on the development of the human brain. Neurons, the nerve cells which make up the brain’s neural net, are developed out of stem cells some distance from where they need to eventually end up. This distance can be many thousands of times the diameter of these cells. In the brains of people with dyslexia, some of these neural cells have not migrated to their correct place, judging by where they’re in the brains of non-dyslexics. Why did this happen? Apparently the causes can be diverse. The kind of neuronal migration problem that reputedly causes dyslexia can come from some variety of shock or disruption, or the breakdown and failure of certain signals from the genetic code that don’t get transmitted or translated correctly. These disruptions don’t all share the same cause. They can be caused by infections, mechanical injury to the brain, toxic exposure, intrauterine strokes, even by genetic factors. However, in all cases, they reflect an upset to the developing brain during gestation, some time between 16 and 24 weeks. Recent studies suggest the gene known as DCDC2 may be a major causative factor in up to 20 % of dyslexia cases. Whether the gene causes dyslexia or sets up conditions that allow it to develop is still confusing.
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