When two people are sharing an emotional experience, attunement means the emotional connections between them such as when one person mirrors or matches the affect (biological expression of the emotion) of the other. It is not the same as sharing the emotion. If a person is attuned to someone’s despair he is not in despair himself but is matching how the other is expressing their despair, such as low tone of voice and slow pace to words.
DDP Network > Glossary > Attunement