Hi, There are two issues here: *** First, speech / language is the result of a social need to communicate. Just producing sound is not sufficient. - You have to identify (or get your doctor to identify) WHERE the problem is. A (brain) stroke can impair / remove the ability of the patient to understand and process speech, and so he cannot respond properly. It can also hamper / affect the ability of the larynx / vocal cords (where sound or speech is actually generated) to function properly and so this would also interfere with the production of speech. *** Also, in the same way, the muscles of the face/neck and jaws must move properly to allow seamless speech production. Of course, if there are issues with eating and swallowing, this also may hamper the process of speech. Mood disturbances are also common after a stroke and would also affect speech, language and communication. - I would strongly advise you to consult a good ENT, general physician or neurologist to first find out the exact problem. Many a time multiple factors exist, and yes, speech and language therapy, occupational therapy, psychotherapy and psychological counseling, and also physiotherapy may be required in the overall and long term rehabilitation of a stroke patient. Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Jayita Poduval, ENT Specialist