From: Socionics :: Groups of Intertype Relations
Energy based relationships:
"One static and one dynamic. Functions of one partner's mental loop correspond to functions of other partner's vital loop.
More subconscious impact than exchange of verbalizable information. Termed "relations of attraction" by Augusta."
So, how do we notice this in real life? Is it the feeling that we enjoy the company without having to say very much? Feeling of relaxation? Some kind or "wordless understanding". With duals and semi-duals it is obvious to me from the first seconds of interaction, but it can also be felt with for example your beneficiary (ISTj for me). Or am I just pretending?