attachment theory identified a new basic motivational system to account for the missing link in the intergenerational chain… attachment theory insists that its fundamental motivational system is not derivative from other basic instincts but is basic in its own right
This passage makes the programmatic claim that attachment theory constitutes an autonomous motivational system that challenges and partially displaces psychoanalytic developmental theory on multiple fronts.
, Loss: Sadness and Depression (Attachment and Loss, Volume III), 1980thesis