Dysarthria is defined as a disorder affecting:

Dysarthria is a motor speech disorder resulting from neurological injury that affects the muscles used in speech production. This condition can lead to slurred or slowed speech, difficulty articulating words, and challenges in controlling the pitch, loudness, and rhythm of speech. The key aspect of dysarthria is that it directly impacts the physical ability to produce speech sounds due to weakness or incoordination of the speech muscles.

While emotional regulation, muscle coordination, and cognitive processing are important aspects of overall communication and functioning, they do not specifically define dysarthria. Emotional regulation might affect how one communicates, but it is not the primary concern in dysarthria. Muscle coordination is a broader term that may relate to other motor skills, but dysarthria focuses specifically on the coordination and control of muscles involved in speech. Cognitive processing is more related to understanding and generating language, rather than the physical production of speech itself. Thus, the correct focus for defining dysarthria is its direct impact on speech production.