According to lead author of the study Nina Kraus, Hugh Knowles Professor of Neurobiology, Physiology and Communication at Northwestern, the biological underpinnings all revolve around the brain and a seemingly unrelated action – a person’s hearing ability.
According to Time magazine "The researchers, who reported their findings in the Journal of Neuroscience, recorded the automatic brain wave responses of 100 kids aged six to 13 as they heard speech sounds. The brains of the more adept readers encoded the sounds, or processed the speech into brain waves, in a more consistent way than those who struggled to read. The latter group tended to show more erratic and fluctuating patterns, which understandably meant that their brains were less able to consistently connect sounds with words. That in turn could interfere with their ability to read, since reading in part involves a virtual hearing of printed language. “Understanding the biological mechanisms of reading puts us in a better position to both understand how normal reading works and to ameliorate it where it goes awry,” study author Nina Kraus, a professor of neurobiology, physiology and communication at Northwestern University said in a statement."
Read more: http://healthland.time.com/2013/02/20/researchers-find-a-biological-marker-for-dyslexia-in-kids/#ixzz2Lb0S1L7k