Apraxia of Speech (AOS) has been defined as an alteration of the programming speech with difficulty initiating speech, slow articulation and varying distortion of phonemes.
In other words, people with Apraxia of Speech can know exactly what they want to say, but at the time of pronouncing they do not remember how they should put the orofacial organs into operation in order to emit each sound that composes it.
It is a complex problem and, although there may be people with pure apraxia of speech, in most cases this pathology is accompanied by aphasia.