Basically the answer to your question is the focus on Phonetics which is a branch of linguistics that comprises the study of the sounds of human speech and it is concerned with the physical properties of speech sounds, and their physiological production, auditory perception, and neurophysiological status. Therefore if this is not evident in a person with lets say lingual issues, then the receiver of information or speech will not access what is being said, so therefore one or both may care or attention in connection with.................
Hope that helps ?
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