Brief report: treating stuttering in an adult with autism spectrum disorder.

One adult with autism stuttered on about 14 out of every 100 words. The team taught him a short set of fluency rules: slow start, gentle voice, stretch the first sound. They used an ABAB design — rules on, rules off, rules on again — while he talked with different partners.

When the rules were in place, stuttered words dropped to about 2 in every 100. Taking the rules away made stuttering jump back up. Bringing the rules back pushed it down again — a clear, 91.8 % reduction.

Fombonne et al. (2020) and Préfontaine et al. (2026) show that many autistic adults carry extra diagnoses and often skip leisure activities. These surveys remind us that speech is only one slice of life; treating stuttering may open more social doors.

Allen et al. (2009) found that verbal autistic adults talk about music in calm, internal terms. Their focus on inner arousal pairs well with fluency rules that ask the speaker to notice and adjust tiny mouth sensations.

No neighbor paper tried the same rules program, so this case extends the adult-autism toolkit into the speech domain for the first time.

You now have a low-tech script — slow, gentle, stretch — that cut stuttering nine-fold in one adult. Try it during conversation practice, job-interview role plays, or phone calls. Track stuttered words for a week; if the trend mirrors this study, keep the rules and teach self-monitoring so the client can use them anywhere.