The evidence is convergent. Multiple independent sources reach the same conclusion, the underlying mechanism is well-characterized, and even the field's most cautious voices treat it as worth doing.
There seems to be something about the face being cold. Yeah, there's um it's stimulation of the veagal nerve that is in part triggering this response which you know runs through your face. And so that's why the you know the facial immersion is is crucial um to triggering the response.
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put your face in cold water it's gonna absolutely kind of kind of hack kind of short-circuit a lot of your body's fight or flight mechanisms and can really increase the parasympathetic tone
so you can do something as simple as just putting your face in cold water to get a malean dive reflex which can achieve the same thing
if I took an ice cold shower uh and I when I was very upset angry uh the the mood would reverse quite quickly and and I kind of attributed that to stimulation of the Vegas nerve um again it had to be like my head had to be immersed in cold water it could it could have even presumably been dipping my head in a cold water sort of stimulating uh the dive reflex
if I took an ice cold shower uh and I when I was very upset angry uh the the mood would reverse quite quickly and and I kind of attributed that to stimulation of the Vegas nerve um again it had to be like my head had to be immersed in cold water it could it could have even presumably been dipping my head in a cold water sort of stimulating uh the dive reflex
I really think that having your face dipped in a bowl of cold water I've talked about this in the past can sort of stimulate the Mamon dive reflex — so if you put your if you have a big enough Bowl you put your head into it just even just covering your face that can in theory I suppose at least trigger an autonomic response that sort of upregulates the parasympathetic system via the Vegas nerve and that can tone down the sympathetic system
Are we able to tap into the vagus nerve? Yes. Are we able to tap into the autonomic nervous system? Yes.