I honestly would not be surprised to learn that a substantial amount of the specific content of spoken (or indeed keyboarded) utterances originates in movement

I honestly would not be surprised to learn that a substantial amount of the specific content of spoken (or indeed keyboarded) utterances originates in movements of mouth and hands planned by the motor cortex. The reason being that sometimes the speed of production precludes the involvement of ‘higher’ cortical functions, which proceed at a slower pace.