Attunement Shapes Your Brain
Apparently about 50 percent of the population, people of all genders, have a secure attachment style: they were raised by responsive, attuned parents, who recognized their need to go out and explore as well as their need to come back and be comforted, and responded in a timely, attuned way to both. According to A General Theory of Love, this experience of attunement – having all their developmental needs met by attuned parents – literally shapes their limbic brain.
This can explain why it would be carried down through generations as well.