When your "inner voice" speaks in your head, it triggers small muscle movements in your larynx

When your “inner voice” speaks in your head, it triggers small muscle movements in your larynx

Subvocalization means internally pronouncing the words of a text when you read silently to yourself. Research shows that subvocalization involves the movement of the larynx and other muscles involved in speech articulation. These movements are minuscule and usually undetected by the person reading and subvocalizing.