Mutual love simply put is the type of love relationship that goes both ways. It entails that both or all parties involved love the other party equally. Mutually love is mostly expressed in true friendship.
It is entirely different from erotic love. Where erotic love is one sided and not returned by one party in most cases, mutual friendship ensures both parties love each other back.
Top-down processing is cognitive thinking processing when we used general knowledge, experience and information to perceive the specific situation. In top down its means we thinking from generalities and way toward specific.