Sounds like the brain works a little different while playing an improvised piece of music, like in jazz combos. The area responsible for “conscious self monitoring” become less engaged, but also triggers the area responsible for language.
What we can come up with that is when we want to make spontaneous like improvising or being out of the box, it’s good to get away from self judgements and critique.
I found it here and the study below.
Neural Substrates of Interactive Musical Improvisation: An fMRI Study of ‘Trading Fours’ in Jazz
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