there’s two parts to this as far as i see it.
you know how you can’t really tickle yourself? your mind knows what your body’s doing and it compensates however and just shuts that response off.
the other part is that *everything* hurts *much worse* if you *do not expect it*. when you’re biting your own tongue, you’re expecting it. that signal goes past your brain and your responses adjust. when you’re chewing food and accidentally bite your tongue, it’s the last thing your brain expects so it starts throwing danger signs at you in the form of pain.
Long ago I read a psych article about things like this, it’s been so long I can’t point anyone to it sorry, but I remember the basics.
So when you do something like pinch yourself, it doesn’t hurt too bad. But if someone else did that the exact same way and same pressure it hurts. The brain has some mechanism which can mute pain and sensations which you cause to yourself. It’s easy to reproduce of course, just try a few pinches as opposed to biting your own tongue.
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