We do not have a biomarker, and I suspect that when we get a biomarker, we need more than one. There will be different kinds of autism - very many different kinds.
What does all of this mean for how teachers support pupils with autism in the classroom?
I think it’s useful to make clear distinctions between the different types of children who have been diagnosed as autistic.
Those who are intellectually impaired and are diagnosed early cannot very easily be accommodated in mainstream. They tend to have very challenging behaviour.
Then, there are children who have been diagnosed as autistic but who have good language, and might once have fitted into the Asperger syndrome category. They can often really benefit from mainstream education, but you have to be concrete in telling them what you want them to do, and you can’t assume they understand norms of behaviour, as other children do.
Finally, we have the extended spectrum. This will mainly be older children or children in later primary. We don’t currently have a separate label, but it might make sense to treat them as “hypersensitive”.
I’m not sure whether this group is easier to teach or not. If they are incredibly anxious, they might be the ones who won’t come to school any more. That’s a big problem. Schools will need to find ways to build trust with these pupils. Work on building resilience might help them - something that is less likely to work with the neurodevelopmental group.