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Let's take apraxia for example, as this is a deficit where the connection between the brain and your verbal output is disturbed. There's an execution issue, not a muscle weakness - it's just there's no connectivity between what the brain tells you to do and your verbal response.
We would train the right hemisphere using something called melodic intonation therapy, which applies the musicality of the right hemisphere to take over the language in the left hemisphere. This means we use singing to facilitate verbal responses and to alleviate the struggle to produce language.