I have not managed to get access to the paper yet but I wonder if they have considered "treating" only one of the partners to see how much that helps. Is the "t

I have not managed to get access to the paper yet but I wonder if they have considered "treating" only one of the partners to see how much that helps. Is the "treated" partner able to provide almost all of the advantage on their own? Or is the other partner the "blocker" then, making the effort completely futile? Does it work to go through the process without being in a partnership at that time or does it require immediate practice to have a lasting effect on the behaviour? There are so many interesting follow-up questions... Edit: after reading the questions about the movies that the couple were asked to answer, I doubt that my questions actually make that much sense.