I sorta get what you're saying, and tbh I've always found it hard to single out a single muscle from all the other tiny muscles around it. I can already raise one eyebrow alone, and I don't remember when I learned to do it so I don't remember the experience, but I do feel that 'single muscle vs many muscles' when I do that.
With the "muscle" in the mid-back of your brain, I understand that much more. If you respond well to meditation and get a sensation from asmr for instance, if we're speaking on the same area, that area gets sensations if the person is more prone to stress.
When I sort of make myself hotheaded, or have any drug, or even really relax, I feel sensations at that area. I wonder if you're the same.
With the "muscle" in the mid-back of your brain, I understand that much more. If you respond well to meditation and get a sensation from asmr for instance, if we're speaking on the same area, that area gets sensations if the person is more prone to stress.
When I sort of make myself hotheaded, or have any drug, or even really relax, I feel sensations at that area. I wonder if you're the same.