A combination of two or more dysarthria types, occurring when multiple motor systems are affected (common in diffuse or multifocal brain diseases). For example, amyotrophic lateral sclerosis (ALS) often presents with a mixed flaccid–spastic dysarthria because it involves degeneration of both lower and upper motor neurons. The speech characteristics in mixed dysarthria reflect features of its components (e.g., the strained voice of spastic plus the nasal, breathy weakness of flaccid in ALS), making diagnosis more complex than single-type dysarthrias.
Donohue, Cara, et al. "Profiles of Dysarthria and Dysphagia in Individuals With Amyotrophic Lateral Sclerosis." Journal of Speech, Language, and Hearing Research 66, no. 1 (2023).
