SIT is a measure of speech intelligibility that requires the participant to read aloud 11 sentences that increase in length from 5 to 10 words. Speech intelligibility is indexed in terms of percent intelligible. This is determined by calculating the mean number of correct words transcribed from the SIT transcriptions by three unfamiliar listeners and dividing this by the total number of words in the 11-sentence sample.

The MSE will include a set of tasks described by Duffy (2013) that permit consistent rating of perceptual characteristics associated with motor speech disorders. These tasks include vowel prolongation, alternating motion rates, sequential motion rates, and contextual speech (oral reading, picture description, conversational speech). These recordings will be used to complete the perceptual assessment of speech characteristics using the Mayo Clinic classification system.