KPDS 2011-2 Soru=42

It is stated in the passage that ----

To succeed in school, children must master three
skills – reading, writing and arithmetic – but not all
students readily grasp these basic skills. Among
English-speaking children, an estimated 2 to 15% have
trouble with reading or spelling, broadly classified as
dyslexia. From 1 to 7% struggle to do math, a disability
known as dyscalculia. Statistics vary but dyslexia
appears to be more common among English speakers
than among speakers of highly phonetic languages
such as Turkish and Italian. It is believed that at least
one child in most elementary school classes in the US
suffers from dyslexia. Both dyslexia and dyscalculia
defy easy explanation. Neither disorder is the result of
faulty eyesight or hearing, both of which can also delay
language acquisition but are easily corrected. Instead,
children with dyslexia and dyscalculia have working
sensory organs, apparently normal sensory and motor
development and, sometimes, above-average
intelligence. After more than 15 years of research,
investigators now believe these conditions frequently
involve so-called partial functional deficits of the
senses: In affected children, the eyes and ears
accurately register sights and sounds, letters,
numbers and spoken syllables, but that information
is misinterpreted as it is processed in the brain