I'm sure the treatment, isn't much different for adults, as it is for kids. .
It certainly, usually, typically neurological. Genetic or environmental.
For myself, and technically all three of my kids have personal experience with speech and language pathologists, it's repeating words, testing different phonetic areas. I still stumble, at times, in speech, as an adult. Stop, focus take your time.
Sent from my LG-MS910 using Tapatalk 2