Autism is classified as a developmental disorder. It also has a strong genetic basis.
While personality disorders are linked to genetics, their is very direct evidence for genetics leading to symptoms relating to autism.
It is categorised as a developmental disorder because symptoms often begin at a young age (including infancy) such as differences between children with autism and the wider population with eye contact and seeking comfort from attachment figures. It is also useful to consider autism as a developmental disorder for treatment, as a person with ASD will often have a different developmental trajectory to the wider population.
Latest Answers