This is a basic description of Apraxia. I will add more as it comes available to me.
Apraxia of Speech (AOS) is a motor speech disorder (MSD) affecting an individual’s ability to translate conscious speech plans into motor plans. Like other apraxias, it only affects volitional movement patterns. Dyspraxia of speech, verbal dyspraxia, and other terms, usually refer to variants of AOS, or a less severe version of the disorder.
