I haven't heard of EMDR until today. Seems they are using eye movements resembling sleep REM to treat psychic problems.

I wonder if some part of the patient moves to or stays in F 27 during the treatment as there is no explanation to how the therapy works!

http://en.wikipedia.org/wiki/Eye_movement_desensitization_and_reprocessing

I went through this therapy for a fear of flying, which came upon me suddenly in middle age. The process was very "nuts and bolts" as I recall. Basically accessing the unpleasant memory and bringing it into the "mainstream" memory territory, where it is de-emphasized and re-prioritized below more realistic and positive memories/sensations. The eye movement basically flips the memory switches and enables the re-shuffling of the memories. For me, It worked to some degree, but not completely.

I have heard of EMDR before and had two quick rezctions to the post.

Another technique for dealing with PTSD is called EFT, which has multiple uses and possibly that works on a sub thinking level to remove blocks. Easy to google.

I'm reading something by a person described as an energy healer named Deborah King. In one of her books, she includes an exercise that she says many shaman use, including Don Juan in Castaneda's books. She refers to the technique as "recapitulation."  You use it to disconnect from bad experiences you have had with people. In the exercise, you use your breath and you use a left-to-right-and back head movement. The bit about the eye movement in EMDR, while different, seems to me to be a little similar. How can the back-and-forth movement affect one physiologically?

Lucy,
If I remember correctly, it basically disconnects the existing pathway of association to the bad via the optical nerve and its relationship to the brain,
making new associations to better memories take a higher priority in your memory. That is just an end user's perspective of the therapy.