What aspect of speech is affected by dysarthria?

Dysarthria primarily impacts the physical production of speech due to neuromuscular impairments. As a result, the characteristics that are predominantly affected include the speed and clarity of speech. Individuals with dysarthria may struggle with articulating words clearly, leading to slurred or slow speech, which directly influences how well speech can be understood.

Volume and intonation, while potentially affected, are often secondary to the primary issues of speech execution that dysarthria causes. In contrast, grammar and vocabulary are generally unaffected by dysarthria since these language components involve cognitive processes rather than the physical ability to produce speech sounds.

Thus, the consideration of speed and clarity encompasses the central features impacted by dysarthria, making it the most suitable choice in this context.