I have read books by Wallin, Seigal, Maroda, Muller and many articles. Perhaps it is only the dismissive they try and draw in this way.
One of those guys described it as just sitting and communicating right brain to unconscious right brain until the force of the therapist's right brain caused the client to quit pushing the therapist away and let the therapist empathy at the client(the client's reluctance for such, in the passage, allegedly was distressing to the therapist who very badly wanted the client to love him).

The first one I see used to talk about her interactions with me changing my brain until I got her to stop because she refused to explain how or why it would be useful.