The nervous system “locks up” under tension — this means that at the moment of trying to speak, a protective reaction is triggered, and the muscles of the jaw, tongue, and throat reflexively tighten. In other words, the brain sends the command to “speak,” but the body does the opposite — blocking the movement. Why this happens: 1. Threat response is triggered (fight / flight / freeze) The brain perceives the act of speaking as dangerous (fear of making a mistake, shame, pressure, anticipation of stuttering). It activates an ancient protective mode → ✔ heart rate increases ✔ muscle tone rises ✔ breathing becomes irregular ✔ jaw and throat tighten Speech is fine motor control, and in threat mode, fine motor control is suppressed. 2. Command conflict: “speak” vs “don’t” Consciously, you want to speak. Subconsciously, the nervous system says: “Stop, it’s dangerous.” A neural conflict arises → muscles receive conflicting signals → a block occurs. 3. Fixation on a word intensifies the spasm When you “force” a word out, you increase tension → tension intensifies the block → a closed loop forms: fear → tension → block → even more fear. 4. It’s not weakness or “psychology” This is an automatic neurophysiological reaction, learned over time. The nervous system has simply learned: “Speech = risk → better to tighten up.” That’s why: — you can speak freely in some situations — and completely block in others (because the context = different levels of perceived threat to the brain) Conclusion: The block is not a problem of the tongue. Not a problem of words. Nor a problem of willpower. It is a problem of regulating tension in the nervous system at the moment of speaking.