A motor speech disorder due to bilateral upper motor neuron (pseudobulbar) damage, producing spasticity in the speech musculature. It is characterized by slow, effortful, and labored speech, a strained–strangled voice quality, monopitch and monoloudness, and slow but regular speech AMRs (alternating motion rates). Speech may sound harsh with imprecise consonants, reflecting reduced range of motion and excessive muscle tone in articulators (distinguishing it from flaccid dysarthria’s breathy weakness).
Clark, Heather M., et al. "Clinical and Imaging Characterization of Progressive Spastic Dysarthria." European Journal of Neurology 21, no. 3 (2014).
