Yes, your correct. I was taught when I was younger that these where called “blocks” In my speech therapy meetings I had five other students in my small-ish middle school who stuttered and came to speech therapy with me. I was the only one who suffered from these blocks. Even other stutterers looked confused when I described it. Stuttering is super weird. We are not all the same. Some have more struggles with “repetitions” (I.E I w-w-w-w-w-w-would like some water) others “prolongations” (I.E Can sssssssssssssssssssomeone please turn down the music). Then some of us can have blocks. Where you just cannot fucking speak. To other stutterers credit, physically not being able to speak is a bit complicated. Sure they have stuttering, like repetitions or prolongations, but they can still *speak* it’s just hard to not stutter and super annoying. But goddamn, FUCK blocks. I remember raising my hand to answer a question in class. The teacher called on me, I KNEW the answer, but when everyone turned to look at me, I had a bad block. I just sat there like a moron. Quietly. Before finally the teacher said, “….ok, sometimes us teachers mistake stretching for a hand up” and to be fair that was a good bail out for me. But I always had that memory come up whenever I thought about raising my hand in class.