I've recently became aware of the concept of subvocalization, where people make tiny motions with their vocal cords when reading. I'm looking for a clarification on the subject:
Does subvocalization only take place when reading, or does it take place during thinking too?
I found a some articles on the subject of detection of subvocalization
Modern technology can detect the small movements made during subvocalization by monitoring electrical impulses. As of 2011, the National Aeronautics and Space Administration (NASA) is working on technology to detect these forms of silent speech. By reading these faint electrical impulses that occur during the process of subvocalization, machines could appear to read a person's mind and respond seemingly without the person saying anything. All the person would need to do is clearly think the command he wants the machine to carry out.
The last statement makes it seem as if subvocalization can be detected during thought.