Sign language and autism.

The authors read every paper they could find on sign language with autistic children. They looked at more than 100 kids who had no speech. The review asked two questions: Can these children learn signs? Does signing help daily living skills?

Most children learned to understand and use signs. Parents and teachers saw better self-care and fewer tantrums. Only a small group started to speak after sign training. The takeaway: sign works, but speech needs extra steps.

Jarmolowicz et al. (2008) later showed you can test why a child signs—mand, tact, or imitation—just like you test vocal words. This extends the 1981 view by giving clinicians a clear assessment tool.

Van der Molen et al. (2010) went further. They added a 3-5 second prompt delay and a spoken model while teaching sign mands. Non-vocal children began to vocalize. This builds on the 1981 finding that sign alone rarely creates speech.

Mastrogiuseppe et al. (2015) seems to disagree. Toddlers with autism used fewer gestures than peers. The gap closes when you look at age: the review studied older, non-speaking children who already lacked speech, while the 2015 paper watched babies still learning to move their hands.

If a client has no speech, start sign training today. Use mand sessions with a short delay and pair each sign with a spoken word. Track daily living skills—expect gains in dressing, eating, and play. For toddlers who gesture little, sign may take longer; stay patient and keep trials fun.