The colors of the arcuate fasciculus indicate the level of randomness of water diffusion within the structure, and thus the integrity of white matter tracts and fiber organization. Those values, in turn, correlate with scores on a verbal task.
(Credit: Zeynep Saygin/MIT)
Dyslexia is a common learning disorder that affects around 1 in 10 people in the U.S., where it is typically diagnosed around second grade but sometimes goes undiagnosed and unmanaged well into adulthood. And though it is technically a learning disorder, it actually occurs in people with normal vision and intelligence
, according to the Mayo Clinic.
The research, published August 14 in the Journal of Neuroscience
, involved scanning the brains of 40 children who are part of a larger study assessing pre-reading skills. Researchers confirmed a correlation between the size and organization of the arcuate fasciculus
and performance on tests of what is called phonological awareness, or the ability to identify and manipulate the sounds of language.