Autism Is a 'Spectrum' Disorder People with autism can be a little autistic or very autistic. Thus, it is possible to be bright, verbal, and autistic as well as mentally retarded, non-verbal and autistic. A disorder that includes such a broad range of symptoms is often called a spectrum disorder; hence the term "autism spectrum disorder." The most significant shared symptom is difficulty with social communication (eye contact, conversation, taking another's perspective, etc.).