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Illustration of two alternating rest blocks and sustained vowel production blocks. Above: block stimulus presentation consisting of 30s rest blocks, alternated with 30s sustained vowel blocks (‘Ah’) in which participants were instructed to produce 3–5 second self-paced /ɑ/ vowels. Below: example head microphone recording of self-paced /ɑ/ vowels produced during the 30s sustained vowel blocks. Example recording taken from a healthy control participant.
