I was wondering if this is a question from a book called “The giver”? If not can you name the book?
If it is a question from the book “The Giver” Jonas isn’t allowed to tell the people, friends, and family about the memory’s. Meaning it stays between him and the giver. Jonas has a hard time with this rule because he wants to tell his friends and sister.
Humans are hardwired to do what we see, hence the term, monkey see, monkey do. The relationship between “catching” a yawn and social behavior is that we subconsciously “catch” the yawn to be seen as “normal” because it is what someone around us has done. A lot of it goes back to psychology. I would suggest looking up Solomon Asch’s human conformity experiment to get a better understanding. :)