I would like to finally mention another ``neurological'' NLP technique which is a simple variation on anchor collapsing. This, as far as I know, is useful only to get rid of a specific short term bad feeling, to get a subject out of the mood they're in because they received some bad news or had something bad happen today. I don't have a lot of experience using it but one of the assistants in my master practitioner training works as an elementary school counselor and says he uses it with students a lot. (It's really great for kids.)
The technique is called, I believe, the New Orleans Kinesthetic Collapse. Your subject is feeling bad about something and wants to lose that bad feeling. So you ask ``How would you like to feel?'' When the subject answers ``Happy'' or whatever (try to get a strongly positive response) you then ask ``What would that look like? Can you show me how you'd look if you were happy?'' The subject demonstrates that, probably mugging it up (this is not something one needs to be real serious about).
You then say to the subject ``Okay, so now I want you to be happy on the outside but unhappy on the inside.'' The subject has no trouble doing this. (Otherwise, you need another technique.) Now you say, ``Now I want you to switch: be happy on the inside and sad on the outside.'' This is harder. When the subject has mastered that, you have him switch again. Then switch again, until both states are fairly well mastered. Then you say ``Okay, now be happy outside and sad inside, and when I snap my fingers, switch. And then when I snap my fingers again, switch again. And keep doing it.''
Once the subject has this process down, you start speeding up the finger snaps until you reach the point where just as the subject starts to settle into one state you give them the signal to switch again. It shouldn't take more than five minutes or so overall.
Why does this work? Is it because one is confusing the nervous system? Or is it because physiology influences emotional states (as is known to psychologists)? Or is it simply a fun game that acts as a distraction? I don't know. I think there's an interesting research question here.