I remember reading a study for early education that found that simply touching each student (high-five, hug, etc) every day significantly improved their perform

I remember reading a study for early education that found that simply touching each student (high-five, hug, etc) every day significantly improved their performance. I imagine the need for a personal connection to the teacher diminishes gradually as we mature. The problem I see is how do you scale personal connections and foster more social bonds?