Hi, Trish. I'm a mere layperson so I won't venture to answer that. I haven't seen anything that directly gives cause/effect attributes on dysarthria. I was looking at this book, Handbook of Neuropsychology and Aging By Paul David Nussbaum, and it does show a lot of correlations with MS, stroke, ALS and others.

My medicalese is not even a little good enough to draw conclusions from my limited reading.