"Every time we have a real-life interaction with somebody our younger vagus nerve, sometimes also called our social engagement system is activated and exercised

"Every time we have a real-life interaction with somebody our younger vagus nerve, sometimes also called our social engagement system is activated and exercised, like a muscle." Whaa? Where does this come from? Extraordinary claim with no citation, somehow linked to loneliness? I get that remote work may be lonely for some people, but I've been doing it for years now, and it's the most relaxing, friendly, and pleasant work environment I've ever been in. I'm a thinker, and I need to be alone with my thoughts.