This advice-column-style blog for SLPs was authored by Pam Marshalla from 2006 to 2015, the archives of which can be explored here. Use the extensive keywords list found in the right-hand column (on mobile: at the bottom of the page) to browse specific topics, or use the search feature to locate specific words or phrases throughout the entire blog.
Q: Do you have any suggestions for how to elicit the /k/ and /g/?
Use the velar raspberry because it is the infant’s precursor to /k/ and /g/. If the child can make a velar raspberry, he is articulating in the back and only needs to refine the sound. Practice the raspberry long and short, loud and soft, big and tiny. Shape it into /k/ if the raspberry is voiceless. Shape it into /g/ if the raspberry is voiced.
Use /y/ if your client already has it because it too is a back sound. Have him say “yuh-yuh-yuh…” and tell him to push up higher in the back. You may start hearing “gyuh-gyuh…” Then you’ve got it.
Tell the client you are fastening a string to the back of his tongue. Then tell him you pulling it upward. Tell him to lift his tongue as you pull the imaginary string upward. Have him try /k/ or /g/.
External Tactile Cue
Tap the back of the crown of the head to show him the high spot where he should push the back of the tongue up.
Push down on the back of the tongue, gently, and ask the client to push up against your finger. If he is hyposensitive like so many apraxic children are, then it will not cause him to gag.
Wayne Secord et al (2007) has written a wonderful little book called Eliciting Sounds. It is filled with hundreds of ideas for eliciting phonemes. (New York: Delmar Learning).