DDK (short for “diadochokinetic” rate) is a measure of how quickly and accurately someone can produce a repetitive movement. Doctors might have you flip your hand palm up/palm down multiple times. Speech-language pathologists will have you say sounds over and over. (I’ve always thought it was a particularly nasty kind of linguistic irony that if you are unable to repeat a movement the technical name is “dysdiadochokinesia”, which of course, has multiple repetitions of sounds. Ugh.)
The sounds SLPs target in an oral mechanism exam are /p/, /t/ and /k/. The /p/ is to check lip functioning, /t/ is for tongue movement, and /k/ is velar movement. In this video you can see that my lips are asymmetrical. My top left lip (right side of the video) is especially immobile.
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