I think there’s definitely some truth to this. Then again there’s a genetic component for me (runs in my family) and most people with anxiety don’t stutter. So it seems like maybe a combo of being predisposed to it plus anxiety/getting stuck in a cycle of fear. There’s also a theory that speaking alone vs. speaking to others involves different parts of the brain, since only the second one involves actual communication. Oddly, I usually won’t stutter speaking alone to myself, but if I set up a recording device I will. There is no rational reason for me to feel anxiety in that situation, since a recording device can’t judge me, but my brain seems to perceive it as another person. It’s weird. Interesting stuff to think about. The variability of stuttering is one of the most confusing and frustrating things.