Dyslexia Vs. Hyperlexia
By
now most of us know what dyslexia is, thanks to movies and other awareness
programs running in our immediate environment.
Let me give you a quick recap of
a dyslexic!
Dyslexia
is understood as a “neurological disorder”, which affects children and adults usually
with reading. Dyslexia works on two different theories. One, “Phonological-Deficiency
Theory” and two, “Magnocellular Theory”. (article
by Ramus (2001) titled Dyslexia Talk of Two Theories)
The
first theory, as we all would know that a dyslexic has problems decoding the
written text. They have a problem recalling basic speech sounds (phonemes) that
correspond to what they are visually seeing on paper. For example, they see the
word bat but have a difficult time retrieving the sounds that the
letters ‘b’, ‘a’ and ‘t’ make alone or in combination. Their brain finds it
difficult to plot the letters to the sounds associated with each alphabet. This
malfunction in neurological function deeply slows down a student from making
the same growth in reading as their peers.
The
second theory “Magnocellular Theory” on the flip side, argues there may
also be subtle sensory defects in people with dyslexia as well. There is
evidence that the brains of some people with dyslexia have “subtle neurological
abnormalities” in both visual and auditory sensory areas. Magnocellular
theorists believe that the phonological problems may be “caused by basic
deficiency in hearing sounds, and that visual deficit might independently
contribute to reading problems. (ref. Ramus 2001)
The
article by Ramus (2001) continues by stating that the magnocellular theory is
itself being challenged. There have been additional studies where “auditory
processing [in people with dyslexia] has not been found to be impaired.” Those
in the study who had both auditory problems and dyslexia were only around
one-third of the subjects. While sensory deficiencies show up in people with
dyslexia, the “prevalence and significance of such deficits remain uncertain”
(Ramus, 2001).
Now, some light on what is
HYPERLEXIA?
There
has been a lot of work done on dyslexia. But, very little awareness has been
around for hyperlexia. If Dyslexia is a reading disability, hyperlexia
is a comprehension disability!
What
does that mean! Let’s try to understand it with the help of a scenario.
A
child named Rahul, now aged 11 is a very intelligent child. At the age of 2
years, he can read big words like hippopotamus, at age 3, he is able to
read full sentences. By age 5, he manages to read books above his age level.
WOW! Great, isn’t it? Now, on the flip side to this, Rahul is very quiet, doesn’t
mingle with people around him and comes across as a snobbish child. Slowly as
the time progresses, the teachers tell the parents that Rahul reads superfluously,
but doesn't understand the written word. His comprehension skills are very
poor. Doesn't find the right words to answer to what is asked! It seems like he
knows a lot of things. But, we just can't get him to talk.
Rahul
has hyperlexia. The more one learns about hyperlexia, the more one realizes
that his language acquisition was typical of children with hyperlexia, as were
his interests and strengths. He is very good at recognizing patterns; he's a
visual learner. He likes routines. When he did start talking, he consistently
mixed up pronouns. He still takes things very literally. Most children learn
how to talk on their own, simply by being surrounded by spoken language. Then,
after they've been talking for a while, someone very deliberately teaches them
how to read. Children with hyperlexia are just the opposite. They learn how to
read simply by being surrounded by printed words. We don't really know how.
Then, after they've been reading for a while, someone has to very deliberately
work with them on how to communicate verbally.
Language
and Learning Disorders
Important
symptom is the language learning disorder seen in these children. Of those
children who talk (some children with hyperlexia are nonverbal), many show this
language pattern:
- Early
speech and language attempts are echolalic (both immediate and delayed)
- Good
auditory memory for rote learning, such as songs, the alphabet and
numbers, as well as good visual memory
- Comprehension
of single words (mainly nouns) is better than comprehension of sentences
- Learning
language in chunks and transferring whole phrases into appropriate places
(Gestalt processing)
- Obvious
abnormalities in structure or content of speech, including stereotyped and
repetitive speech, reversal of pronouns, and peculiar use of words or
phrases
- Noticeable
impairment in the ability to initiate or sustain a conversation, despite
adequate speech.
Social
and Interpersonal Development
Symptoms,
some of which may be related to insufficiency in language comprehension, also
are frequent in this faction of children. These are associated with social
relatedness, pragmatic and behavioral issues, and may be associated with
nonverbal learning disability:
- Non-compliant
behaviors
- Ritualistic
behaviors
- Self-stimulatory behaviors (such as hand-flapping or fidgeting)
- Extreme
need for sameness
- Difficulty
with transitions
- Sensory
sensitivities
- Tantrum
behaviors
- General
anxiety/specific unusual fears
- Difficulty
in groups
- Difficulty
in socializing with peers
- Sensitivity
to loud machine noises
- Impaired
ability to make peer friendships.
Differences
between Developmental Dyslexia and Hyperlexia in a snapshot:
Dyslexia
|
Hyperlexia
|
Poor decoding
|
Superior
decoding
|
Adequate listening comprehension
|
Poor
listening comprehension
|
Reading Comprehension supersedes the
decoding
|
Reading
Comprehension inferior to decoding
|
spellings are below average
|
Spellings
are above average
|
Average OR above average IQs
|
Below
average to average IQs
|
Top-down processing
|
Bottom up
processing and are data driven
|
They see the big picture, are concept
driven
|
Use
of Grapheme to Phoneme rules and word-specific tackling of pronunciation
|
Use of text-to-speech tools
|
Use of
speech to text tools.
|
Clinical neurological symptoms
usually are missing
|
Clinical
Neurological symptoms are usually present.
|
Ref:
Dyslexia
and Hyperlexia: Diagnosis and Management of Developmental Reading ... By
P. G. Aaron
These
are few indications towards hyperlexics. How do we help these children, we will
see in the next article.
Further reading: