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The clinical groups selected for this study along with their associated speech motor subtype, presumed neurological deficit and pathophysiological mechanism, and example articulatory patterns based on the Darley, Aronson, and Brown (DAB) model (ALS = amyotrophic lateral sclerosis; PA = progressive ataxia; PD = Parkinson’s disease; nfPPA+PAOS = the nonfluent variant of primary progressive aphasia and progressive apraxia of speech).
