Both apraxia of speech and aphasia affect an individual’s ability to communicate – they just do so in different ways. Apraxia makes it hard to coordinate muscle movements and put sounds in the right order to produce intelligible speech. It may also impact on speech planning. Individuals can struggle with consonant clusters, rhythm, and stress, and may generally experience difficulties with aspects related to the prosody of language.
On the other hand, aphasia is about language retrieval and recognition. People with aphasia or dysphasia may not be able to find the words they need to express themselves in speech or in writing, or they might use the wrong words and not realize it. Additionally, individuals with receptive aphasia don’t always understand what other people are saying and can finding listening and reading challenging.
If aphasia and apraxia of speech are the result of a stroke, a person may also experience difficulties with enunciation, referred to as dysarthria. This can present as trouble controlling the volume levels of speech, excessive drooling, or problems getting enough air while speaking. Dysarthria is caused by weakness or paralysis of the muscles of the lips, tongue, throat and face.