One can, with enough practice, learn to silence one's internal monologue.
It then becomes apparent that a great number of things are able to be done without an inner voice. Volition seems to occur spontaneously and it becomes ambiguous whether narration proceeds volition of volition proceeds narration.
It's still unclear what the limits of action-sans-monologue, reading seems especially hard for the sub-vocalist, conversation, or planning. But who knows, it's a fertile ground for n=1 experiments.
It then becomes apparent that a great number of things are able to be done without an inner voice. Volition seems to occur spontaneously and it becomes ambiguous whether narration proceeds volition of volition proceeds narration.
It's still unclear what the limits of action-sans-monologue, reading seems especially hard for the sub-vocalist, conversation, or planning. But who knows, it's a fertile ground for n=1 experiments.