Here's an interesting article about attachment in therapy and how it heals:
http://www.afterpsychotherapy.com/at...-relationship/
My own T says that exploring these things in therapy creates new neural pathways that help us grow and heal. It is possible to grow new pathways and change our patterns, even if it is terribly difficult and even though we may never be completely like people who grew up with 'normal' or 'good enough' attachments.