Model provides new insights into how autism arises

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The development of autism may now become easier to understand, thanks to an explanatory model presented in a thesis from University of Gothenburg, Sweden. This model provides new insights into how various risk factors give rise to autism and why there is such great variability between individuals.

Autism, a neurodevelopmental condition, affects how people perceive the world around them and how they interact and communicate with others. Among individuals with autism, there are major differences in terms of personal traits and manifestations alike. The disorder is therefore usually described as a spectrum, with numerous subtle variations.

The new explanatory model is theoretical but simultaneously practical in application, since its various components are measurable through, for example, questionnaires, genetic mapping, and psychological tests. The model describes various contributing factors and how they combine to prompt an autism diagnosis and cause other neurodevelopmental conditions.

Three contributing factors

The model links three contributing factors. Together, these result in a pattern of behavior that meets the criteria for an autism diagnosis:

1. Autistic personality — hereditary common genetic variants that give rise to an autistic personality.

2. Cognitive compensation — intelligence and executive functions, such as the capacity to learn, understand others, and adapt to social interactions.

3. Exposure to risk factors — for example, harmful genetic variants, infections, and other random events during gestation and early childhood that adversely affect cognitive ability.

The autistic personality is associated with both strengths and difficulties in cognition but does not, as such, mean that diagnostic criteria are fulfilled. Still, exposure to risk factors that inhibit people's cognitive ability may affect their capacity to tackle difficulties, which contributes to individuals being diagnosed with autism."

Darko Sarovic, physician and postdoctoral researcher at Sahlgrenska Academy, University of Gothenburg

The model makes it clear that it is the many different risk factors combined that bring about the major differences among individuals on the spectrum. The various components of the model are supported by results from previous research.

Adaptive ability

High executive functioning skills may enable people to compensate for their impairment in such a way as to mitigate the symptoms, which reduces their risk of meeting the diagnostic criteria for autism. This may explain why, at group level, researchers observe a lower degree of intelligence among people diagnosed with autism, as well as other neurodevelopmental conditions. It also affords an understanding of why intellectual disability is more common among these groups. Thus, the model indicates that low cognitive ability is not part of the autistic personality but, rather, a risk factor that leads to diagnostic criteria being met.

"The autistic personality is associated with various strengths. For example, parents of children with autism are overrepresented among engineers and mathematicians. The parents themselves have probably been able to compensate for their own autistic personality traits and thus not met the criteria for an autism diagnosis. The impact of the disorder has then become more noticeable in their children owing, for instance, to an exposure to risk factors and relatively low cognitive ability," Sarovic says.

Difference between girls and boys

The diagnosis of autism is more common among boys than girls, and girls often get their diagnosis later in life. Some girls reach adulthood before being diagnosed, after many years of diffuse personal difficulties.

"Girls' symptoms are often less evident to other people. It's well known that girls generally have more advanced social skills, which probably means that they're better at compensating for their own difficulties. Girls also tend to have fewer autistic traits and be less susceptible to the effects of risk factors. Accordingly, the model can help to answer questions about the gender gap," Sarovic says.

Research and diagnostics

The model also proposes ways of estimating and measuring the three factors (autistic personality, cognitive compensation and exposure to risk factors). This makes it possible to use the model in the planning of research studies and interpretation of their results.

Diagnostics is another conceivable area of ​​use. In a pilot study in which 24 participants had been diagnosed with autism and 22 controls had not, measuring the three factors of the model enabled more than 93 percent to be correctly assigned to the right category. The model can also be used to explain the inception of other neurodevelopmental disorders, such as schizophrenia.

Darko Sarovic is now a postdoctoral research fellow at Harvard Medical School in Boston, Massachusetts, while remaining affiliated to the Gillberg Neuropsychiatry Centre at the University of Gothenburg, Sweden.


  1. Rachel Sadler Rachel Sadler United Kingdom says:

    As a parent of an autistic child and an educator with many years experience working with autistic adults and children I really question this as any kind of useful explanation. It may well be true that more 'intelligent' autistic people can blend in with the general population but should they have to and who is such conformity meant to benefit? Who decides what 'normal' is when it comes to our incredibly complex neurology? The diversity of human neurology is a strength. Our brains often compensate for deficits in one area with strengths in another, we already know this. If everyone's brains worked in exactly the same way we'd be doomed as a species. This article raises far more questions than it answers and is vastly over simplified.

  2. Kevin Jeffries Kevin Jeffries New Zealand says:

    The human brain is an amazing part the the anatomy. As the father of an autistic son who has had learning difficulties from a young age now surpasses everything I could have imagined. Yes the measure of how they view the world is different but he sees things and understands things that I miss completely. How do you measure intelligence not on a particular scale that a psychiatrist has purposed. My son's perceptiveness far outreaches my own and I would say superior intelligence in many areas. He notices fine details that I completely overlook...therefore I do not see autism as something like a disability but rather an extra ability to see things that other can't.
    Kevin J

  3. Valerie O Shaughnessy Valerie O Shaughnessy Ireland says:

    One of the Most Damaging 'Environmental Risk Factors' you failed to Highlight is the Accumulative Long- term Degenerative Demylinating Damage caused directly to the Developing Brain and Central Nervous System from Multiple Vaccine Administration in early infancy - Accumulative Viral / Toxin Associated Iatrogenic Injury .

The opinions expressed here are the views of the writer and do not necessarily reflect the views and opinions of News Medical.
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