A new study suggests autism may be tied to rapid evolution of brain cells unique to humans—genetic changes that gave us language and complex thinking may have also boosted neurodiversity.

Multiple recent studies and expert analyses indicate a connection between the evolutionary development of uniquely human brain features and autism spectrum disorder (ASD). Research highlights include:

1. Genetic Links to Evolutionary Brain Changes: Studies show that some genetic variants associated with autism were likely positively selected during human evolution because they contributed to enhanced cognitive abilities such as language and creativity.news.yale.edunews.yale.eduGenetic risk of autism spectrum disorder linked to evolutionary brain benefitneurosciencenews.comneurosciencenews.comEvolution of Human Brain May Explain High Autism Rates+1 more

2. Rapid Evolution of Human-Specific Brain Cells: Neuroscience research points to rapid evolution in outer-layer neurons unique to humans, which may underlie both advanced cognitive functions and increased neurodiversity, including autism.zmescience.comzmescience.comThe Evolution of the Human Brain Itself May Explain Why Autism is so Common+1 more

3. Biological Mechanisms Underlying Autism: UCLA-led research provides detailed views of cellular and genetic activity linking autism risk genes to brain changes, supporting the biological basis for this evolutionary hypothesis.stemcell.ucla.edustemcell.ucla.eduStudy connects genetic risk for autism to changes observed in the brain

4. Broader Genetic Studies: Large-scale genomic scans identify new autism-related genes, reinforcing the complexity and evolutionary depth of ASD genetics.cmu.educmu.eduLargest Study to Date Identifies New Autism Genes - Statistics & Data Science -...

5. Conceptual Reframing of Autism: Some sources suggest autism is not merely a disorder but a byproduct of the evolutionary rewiring that enabled uniquely human traits like language and theory of mind.zmescience.comzmescience.comThe Evolution of the Human Brain Itself May Explain Why Autism is so Common

However, while these findings strongly suggest a link between human brain evolution and autism, the exact causal pathways remain under investigation. The studies do not claim that all aspects of autism are explained by these evolutionary changes, nor do they imply that autism is solely an evolutionary trade-off. Other factors such as immune response and neural transmission differences also play roles.health.ucdavis.eduhealth.ucdavis.eduUC Davis study uncovers age-related brain differences in autistic individuals

In summary, the claim that autism may be tied to rapid evolution of human-specific brain cells and genetic changes related to language and complex thinking is well-supported by current scientific literature but should be understood as part of a multifactorial picture.