05/17/2021
At San Diego SLP one of our goals is to support families seeking speech and language services. One way we like to support families is by defining less familiar speech and language terms. Check out our growing blog post ‘Learn the Terms’ on sandiegoslp.com for definitions of some common SLP terms. And let us know what else we should add!
Intelligibility is the amount of spontaneous speech understood by an unfamiliar listener. It is usually given as a percentage, but sometimes is given as a descriptive rating (ex. good, fair, poor, highly intelligible, unintelligible).
Intelligibility is used when determining the presence of speech sound disorders in children and is only one measure in a comprehensive evaluation. It is a perceptual judgment. Intelligibility can be impacted by:
* Presence of speech sound errors
* Communication environment
* Background noise
* Complexity of utterance
* Rate, prosody, fluency of speech
Lower intelligibility in younger children is expected
* In children with typically developing speech sound production, most are:
* ~50% intelligible by 22 months
* 75% intelligible by 37 months
* 100% intelligible by 47 months even if speech sound errors are still present (according to ASHA, though these norms do vary)
If you have concerns about your child’s overall intelligibility and speech sound production, you should contact an SLP in your area. Many provide consultations to determine if future evaluation is warranted.
And if you hear your SLP use a term that is unfamiliar (such as ‘intelligibility’) don’t be afraid to ask what it means! At San Diego SLP we encourage families to ask and ask again.