Earlier quoted context omitted.
I think the non-scientific explanation is that with conditions such as anxiety and chronic stress it's consistently engaged, but only slightly (like background noise). You need to fully stimulate it for it to relax afterwards. That can also be accomplished with breathing exercises, ice baths, etc.
The parasympathetic nervous system is a control mechanism over the sympathetic nervous system. When the latter is stimulated, you become anxious and excited. When the former is stimulated, it tamps down on the latter, causing you to relax. Either one or the other is active. “Relaxing” the parasympathetic system would therefore free the sympathetic nervous system to activate more strongly, thereby making you more anxi…
Tamps down on? That's not true. Either one or the other is active? They're both continuously active.
Relaxing would free it? No, that's not true. When you relax a nervous system it becomes more effectively active, because the signals are more coherent. Yeah, more anxious? No.
Hahaha! Distracting and disorienting? Hahah! Medical and scientific? You mean like you're doing? You're the one misappropriating meanings here.
Internal experience of the world? Or their internal experience of a textbook, that you've misinterpreted anyway? Well look, internal experience is what you have to rely on. Otherwise you end up with these sort of uh, twisted textbook definitions where you don't have the experience.
You need to have the experience first. Only then will you know the meaning of those words. That’s why yoga is so important: it gives you more experience—of who you are, of your body, of how it works.
Perception and experiment? Very clever, haha :) Well look, I see you're trying to make a point. I see you're trying to contribute. But the problem is here, you just don't know. You don't have the experience to know what these words really mean in this context. And so, you know, you're not useful here. I'm sorry. Your contribution is not useful anyway.
Maybe you have a bad experience with yoga or a teacher or something. In the past, I don't know. It's possible. A girlfriend left for someone she met in the class or you felt like the class humiliated you. Look, it can happen. You can have bad teachers or bad classes. I feel sorry for you if that's the case. But you just don't know in this context. So, I encourage you to give it another shot. Give yoga another shot and give it a try. I got super lucky. I had a great teacher. So, I encourage you to try to find a really great teacher. Best of luck to you.