There’s two main categories, but they both have in common a kind of “flow state” where attention and awareness are focused onto the other person. The two categories are:
Flirting, where the back and forth comes from signalling sexual/romantic interest
Productive intellectual discussion with an equal, where the back and forth comes from sharing evidence and updating
Spoilered to avoid anchoring:
There’s two main categories, but they both have in common a kind of “flow state” where attention and awareness are focused onto the other person. The two categories are:
Flirting, where the back and forth comes from signalling sexual/romantic interest
Productive intellectual discussion with an equal, where the back and forth comes from sharing evidence and updating