In May 2011 he defended his PhD thesis named “Autistic-Like Traits”. His research interest lies within the field of autism spectrum disorder (ASD) and concomitant conditions. By employing twin methodology it is possible, among other things, to discern if there are any true demarcations between disorders (for instance ASD vs. ADHD), and within disorders (ASD vs. normally distributed autistic-like traits). He mainly conducts research within the field of epidemiology, where the focus is on prevalence questions and transitions to adulthood for children with autism spectrum disorders (ASD). At the GNC Sebastian Lundström is currently conducting clinical research within an imaging study aimed at understanding the brain physiology in ASD.