Autism or Autism Spectrum Disorder (ASD) is a complex disorder which causes problems with the development of social and communication skills. Get the facts about the signs and symptoms of autism.
What is autism?
Autism is a complex disorder which affects a person’s ability to interact with the world around them. Commonly referred to as autism spectrum disorder (ASD), autism has wide-ranging levels of severity.
This complex neurobiological disorder typically lasts throughout a person’s lifetime and, typically, people with ASD have problems with social and communication skills. Many people with ASD also have unusual ways of learning, paying attention or reacting to sensations.
People with autism often have a restricted range of interests, and have repetitive or stereotyped behaviours. A person with autism has difficulties in some areas of their development, but other skills may develop typically.
In 2007, a three-year study commissioned by the Australian Advisory Board on Autism Spectrum Disorders into the prevalence of autism, led by Perth paediatrician Dr John Wray, concluded that one in 160 Australian children aged between six and 12 years have an autism spectrum disorder (ASD) – which equates to more than 10,000 Australian children in that age group.
ASD describes a group of closely related disorders, which all belong to the same diagnostic category and share the same core symptoms. These disorders include:
Because autism is a ‘spectrum disorder’, there is a wide variation in the way it affects people.
Every individual on the autism spectrum has problems to some degree with:
The level of disability and the combination of symptoms varies greatly from person to person. Classic autism, or autistic disorder, is the most severe of the autism spectrum disorder.
Milder variants are Asperger’s Syndrome, sometimes called high-functioning autism, and Pervasive Developmental Disorder, or atypical autism.
According to the Autism Spectrum Resource Center (USA), only 20 percent of people on the autism spectrum have classic autism. The overwhelming majority fall somewhere on the milder range of the spectrum.
Asperger’s Syndrome and High-functioning Autism (HFA) are both part of the ‘autism spectrum’. The main difference between the two is thought to be in language development: people with Asperger’s Syndrome, typically, will not have delayed language development when younger. You can find an examination of the reasoning behind the existence of the two separate terms here.
Causes of autism
The cause of autism is unknown, but evidence points to physiological causes, such as neurological abnormalities in certain areas of the brain. Autism is less common in girls. On average, four out of every five children diagnosed with ASD will be boys.
This may be because of genetic differences between the sexes, or that the criteria used to diagnose autism are based on the characteristics of male behaviour, but results are inconclusive.
Recent studies have found potential links to ASD with a mother’s levels of some hormones during pregnancy, including testosterone and the stress hormone cortisol, however study authors say the research results do not justify prenatal testing for the hormones that may be linked to autism.
Another recent study indicates that the offspring of ageing dads may have a higher risk of having autism and psychiatric disorders. The results are attributed to sperm-producing cells not copying a man’s DNA as effectively as men get older.
In the last decade, there has been increased theorising about the role of environmental toxins and vaccinations, but there is no convincing evidence that ASD is caused by either of these. With or without the use of the preservative thiomersal (known as thimerosal in the US), there are numerous scientific studies showing no association between vaccines and ASD. Moreover, there is not one scientific study that has shown a causal link.
In 2012, the ABC’s Four Corners program aired a controversial Canadian documentary called The Autism Enigma, which suggested a link between gut bacteria and autism. At this stage, this link is theoretical and, as Andrew Whitehouse, Associate Professor, Telethon Institute for Child Health Research at the University of Western Australia explains here further research is required.
Symptoms of autism
Signs of autism include poor language development, unusual or repetitive behaviours, and a diminished interest in other people. Typically, there are significant concerns about the person’s social interaction, communication or behaviour before a diagnosis of autism is made.
It is worth noting that autism usually manifests in the first year of life and its onset is not later than three years.
Parents can use developmental landmarks as a guide to gauge a child’s development. Early signs may include a child who, at 12 months:
Does not pay attention to or is frightened of new faces
Does not smile or follow moving objects with eyes
Does not babble or laugh
Has no words
Does not push down on legs when feet placed on firm surface
Does not show affection to primary care-giver, dislikes being cuddled
Does not point
Does not imitate others’ actions
Does not respond to name
By 36 months if a child has very limited speech, little interest in other children, difficulty in manipulating small objects and frequently falls, parents should speak to their doctor.
There is a full list of expected developmental milestones and some of the things that might suggest early signs of autism here.
Other symptoms that may be linked to autism include:
rituals and routines
restricted or obsessed behaviour
stereotypical body movements such as flapping and toe walking
isolated, predictable play
In her book Could It Be Autism? A Parent’s Guide to the First Signs and Next Steps, author Nancy D. Wiseman notes: “Many of the danger signs are the very ones that often trouble parents months or years before a child is formally diagnosed with a developmental delay disorder.”
If you are concerned about your child’s development, see your doctor immediately.
Steps to diagnosis of autism
A diagnosis of ASD in children generally occurs after a thorough assessment by a team of health professionals. Because many of the behaviours associated with ASD are also present in other disorders, a medical assessment is important so that other possible causes (such as a hearing problem) can be ruled out. An assessment team is usually made up of a paediatrician, a psychologist or psychiatrist and a speech pathologist. The diagnostic criteria for ASD are set out in the Diagnostic and Statistic Manual Fourth Edition (DSMIV).
In 2014, researchers at Melbourne’s La Trobe University developed a test consisting of five early signs or “markers” of autism to help pick up the condition in infants aged 12, 18 and 24 months. “Red flag” markers for children at age 12 months are a lack of pointing, eye contact, waving bye bye, responding to their name and imitating others’ actions. Two further early markers, at 18 and 24 months, are deficits in showing toys or objects to other people and in engaging in pretend play. The benefits of early detection are huge, as autistic children are able to greatly benefit from early behavioural intervention programs.
In 2012, Science Daily reported that researchers at Harvard Medical School have discovered a highly accurate strategy to reduce the time it takes to detect autism in young children. The test, involving algorithms and associated deployment mechanisms, combines a small set of questions and a short home video of the subject to enable rapid online assessments. More information about the survey here. The video project is undergoing revisions. Research into the strategy is ongoing.
Researchers from Boston Children’s Hospital are investigating a blood test diagnosis for autism. A study published in the journal PLOS ONE describes a new experimental test to detect ASD, based on the differences in gene expression between kids with ASD and those without the condition. The blood-based test appears to predict autism relatively accurately, at least among boys. Clinicial trials for the test were to begin in early 2013.
There is a significant amount of research indicating that early intervention maximizes outcomes and gives people with autism the best possible chance of developing appropriate skills.
Early intervention involves intensive educational and behavioural therapies, which have produced positive outcomes for children with autism.
These programs focus on skill development, building relationships and development of social emotional capacities, sensory motor development and managing the characteristics of autism.
Music Intervention Therapy and Family Based Therapy have also had positive outcomes. There is little supporting evidence for other kinds of programs, or for medical or drug treatment.
For more information and contact information for autism associations in Australia, visit the original article here.
For more parenting articles like this, visit kidspot.com.au
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