Dyslexia may
be more than a reading disorder: Study
A distinctive neural signature found
in the brains of people with dyslexia may explain why they have difficulty in
learning to read and adapting to sensory inputs, according to a study . The
brain typically adapts rapidly to sensory input, such as the sound of a
person's voice or images of faces and objects, as a way to make processing more
efficient. But the study found that for individuals with dyslexia, the
adaptation was on average nearly half.
In
dyslexic people, the brain has a diminished ability to acclimate to a repeated
input -a trait known as neural adaptation. For example, when dyslexic students
see the same word repeatedly , brain regions involved in reading do not show
the same adaptation seen in typical readers. This suggests that the brain's
plas ticity, which underpins its ability to learn new things, is reduced, said
researcher John Gabrieli.
For
the study , the team used MRI technique where the brains of young adults with
and without reading difficulties were scanned as they listened to a series of
words read by either four different speakers or a single speaker. The results
revealed that dyslexic participants showed much less adaptation to hearing
words said by a single speaker. Further, for dyslexics the brain activity
remained high while listening to a consistent voice and not to multiple voices,
suggesting that they did not adapt as much. When researchers looked at
adaptation to visual stimuli, they saw lesser adaptation with dyslexics. This
suggests adaptation deficits in dyslexia are general, across the brain.
Source | Times of India | 23 December 2016
Pralhad
Jadhav
Senior
Manager @ Library
Khaitan & Co
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