Speech-language pathologists are therapists who specialize in treating language problems and speech disorders. They are a key part of the autism treatment team. With early screening and detection of people at risk, speech therapists often lead the way in helping with the diagnosis of autism and in making referrals to other specialists.

Once autism is diagnosed, speech therapists assess the best ways to improve communication and enhance a person's quality of life. Throughout therapy, the speech-language pathologist also works closely with the family, school, and other professionals. If someone with autism is nonverbal or has major trouble with speech, the speech therapist may introduce alternatives to speech.

• Not talk at all
• Utter grunts, cries, shrieks, or throaty, harsh sounds
• Hum or talk in a musical way
• Babble with word-like sounds
• Use foreign-sounding "words" or robotic-like speech
• Parrot or often repeat what another person says (called echolalia)
• Use the right phrases and sentences, but with an unexpressive tone of voice