Boys and girls with
autism may show
different signs of the
disorder
|
Girls with autism may not be
identified because they do not show
traditional signs of the disorder, an
expert warns.
Children with autistic spectrum
disorders have poor social and
communication skills.
Hyperactivity, and interests in
technical hobbies have been seen as
characteristics of the disorder.But
Christopher Gillberg, of the National
Centre of Autism Studies, said girls
were often passive and collected
information on people, not things.
| |
Girls are more
passive and not as
active or aggressive as
boys with autism are
Professor Christopher
Gillberg
|
Around 535,000 people in the UK are
estimated to have autistic spectrum
disorders. The number of boys diagnosed
is much greater than the number of
girls, but Professor Gillberg said the
difference in incidence may not be as
great as currently thought.
'Outsiders'
His theory is partly influenced by
studies which did not find what they
were expected to.Researchers had looked
at the male X chromosome, to see if
genetic faults there could influence a
boy's risk of developing the condition.
But no conclusive link has been found.
Professor Gillberg said: "Scientists
had been very surprised that, so far, so
little has come out of research into the
X chromosome."But it may be that girls
present differently to boys.
"The number of females with autism
spectrum disorders may be
under-diagnosed."
He said studies, including one his
team had carried out into women with
anorexia who were also autistic, as well
as his own clinical practice, had shown
the gender difference. He added: "Autism
may be behind many cases of anorexia. A
girl may be withdrawn and
uncommunicative, without attracting
attention, but when she develops a
calorie fixation it becomes a serious
problem.
"Counting calories may be a
manifestation of autism. "I've seen
quite a number of cases where the
anorexia has become completely
entrenched because people haven't
understood that underlying the eating
disorder is autism."
Lists
Professor Gillberg said that, at an
earlier age girls with autism were
likely to be more passive and not as
active or aggressive as boys with autism
are - and may be seen as simply shy.
"With some girls, there's a perception
they are outsiders, someone who can't
really mix with other children.
"They may tend to either avoid other
children, or be on the periphery of the
group." He said boys were likely to show
interest in technical or maths-related
hobbies, whereas girls were more
interested in people.
"They may have hobbies such as
compiling books about their 'so-called'
friends, and may make lists of their
names and the colour of their eyes and
hair, but not actually interact with
them." Professor Gillberg said girls may
be perceived as simply shy, and parents
and teachers may not realise there's a
problem.
He added that differences in the way
girls and boys learn to speak could also
mask signs of autistic disorders. "Girls
tend to use language immediately, and
use new words as soon as they hear them.
Boys have longer periods of repeating
what they know and processing what they
are learning."
He said both genders may have the
same combination of autism genes, but
girls' natural linguistic ability may
hide the associated language
difficulties. "Autistic spectrum
disorders may be more difficult to pick
up in girls, because they have superior
linguistic abilities."
Judith Gould, director of the
National Autistic Society's Diagnostic
Centre, said: "We still know so little
about this complex lifelong disability
that it is essential we continue to
question current thinking and suggest
alternative theories for its prevalence.
"We would certainly agree we are
probably missing autism in girls due to
the different way in which it often
manifests itself in females.
"We would also agree that anorexia,
which is predominantly diagnosed in
girls, could be linked to autism in an
unknown proportion of cases."
BBC News 28.0605