In 2014, the two categories of autism symptoms were condensed from two to one:  social communication problems.  Understanding that this is now a broader but more accurate domain of symptoms, researchers from Center for Autism and the Developing Brain and UCSF drilled down to distinguish different types of social communication and which were most specific to autism.  Using this approach, these same researchers were able to determine which ones distinguished the social problems in ADHD to those seen in autism.  These results will help clinicians do a better job understanding what are social issues related to other disorders, and which are markers for autism.