Among thousands of Danish adults diagnosed with autism after age 18, less than half were diagnosed with a psychiatric condition as children, a new study shows.

Motor differences are more relevant than has historically been appreciated for understanding, assessing and supporting people on the spectrum.

For Spectrum’s fourth annual book, we offer a guide to prevalence estimates.

The questionnaires used to screen for autism are far from perfect, and tweaking them may not be enough. Roald Øien wants researchers to find better solutions.

Developmental delay, intellectual disability and behavioral issues are common among people who have mutations in MYT1L, a gene with strong ties to autism.

Insurance claims data are useful for autism research, but the field needs to standardize how they are mined, Shea says.

How chemical tags called methyl groups position themselves on genetic sequences may hint at some of the causes of autism.

Children who are diagnosed with autism before age 2 and a half years show more gains in their social skills than children who are diagnosed later.

Autism prevalence in the United States rose to 1 in 44 children in 2018, up from 1 in 54 in 2016.

Almost 60 percent of autistic people may have an average or above-average intelligence quotient, according to a new longitudinal study.