FourIsCompany:Here's what I've discovered in the past week or so and I wanted to bring the discussion back to this thread so as not to mess up any other threads that are going with similar subjects. I hope we can always come back to here with the "straggler" discussions.
Alright, I'll tackle it with ya! 
FourIsCompany:
Examples of +P (providing they actually reduce a behavior):
A mouse trap on a counter
A shock collar
Saying, "No"
Yelping when a puppy bites you
"Tssst"
Shaking a can of coins
A collar correction
A Citronella collar
Hot Sauce on a garbage can
I've struck out the ones that I do not do, or absolutely will not do, to make it easier to talk about.
I've been thinking upon the yelping when a puppy bites you. And I've been thinking on what I've said before in another post on puppies.
In the case of a yelp (and no walking away, just yelping), if the behaviour lessened it would certainly be P+.
However, When when a word is paired with a consequence, such as walking away, it becomes known as a conditioned punisher (also called sometimes a Secondary Positive Punisher) . Something we don't and haven't discussed much here. Gary Wilkes calls it the "negative clicker" (although I don't like that term, and I'll explain why in a bit). It is usually named either a CP or a CP+.
A conditioned punisher is something (a word, tone, facial expression, hand signal, etc) that indicates a punishment will occur if a behaviour continues. It is a cue, if you will, to relay information to a dog. The dog then makes the choice to either do the behaviour anyhow, and go through the punishment, or stop doing as it was doing, and avoid the punishment. There is debate as to whether or not a conditioned punisher is actually P+. Some say it is, as you are "applying" the cue. But others argue that it's just information just like "Sit" is information, and the dog decides what to do with that info - listen or ignore. I lean more towards the second, because just as I think the cue itself is not a punisher, the cue "sit" itself is not a reinforcer (or punisher). It's just a cue.
The reason I don't like it called the "negative clicker" is because it's not an exact opposite. Every time you click the clicker - a treat always follows (for 99% of people who use this anyhow *G*). Everytime you use your CP, a punishment does not always follow - the dog makes the decision as to whether or not the punishment occurs. Which lends more support to the "information" argument rather than the "P+" argument.
Those arguments aside though, I do use a conditioned punisher for some things. One example is indeed for bitey puppies. I use the cue "Ouch" as the CP. In the beginning it is paired with P- of walking away. Eventually the cue "Ouch" develops meaning - if I keep biting she will walk away. So that eventually you can give the cue and just wait and see the dog's response. If the dog understands the cue (after some trials in the beginning to build the association), then it will lessen the biting when you say it without having to walk away. The pup learns the meaning of "Ouch", and learns to modify its behaviour as a result. Like reinforcement, sometimes it needs to occur again in order for it to remain strong. So you say "Ouch", and the pup thinks for a minute, but then decides to bite anyhow. So you walk away, and the pup realizes that you're game all the time, so he should be too.
The thing is, for proper CP development, just as with a clicker development, you need to give your CP "cue" first, and then punish. It doesn't work to say the word after the punishment occurs, or during. It needs to follow the same ABC pattern that teaching a reinforcing cue does. Give cue - behaviour - reinforce. In this case it is unwanted behaviour - CP - punishment. And of course the best course of action is to follow up with reinforcement of the desired behaviour (refraining from biting, not pulling, moving away from object, etc), just as the dog begins to do it.
So, if you lean more towards the "P+" side of it, then you would say I used a P+, and I won't feel badly for that. But I look at a CP as simply a cue. Just as I don't call the "sit" cue a positive reinforcer (or punisher), I don't call the "Ouch" cue a positive punisher. They are information that is conveyed to an animal, in which the animal knows the results of either complying or not complying, and depending on the motivation chooses which path they will take.
There is said to be a lot of benefit for the use of a conditioned punisher rather than just using a punisher on its own, whether used with P+ or P-. Firstly, it gives the dog the opportunity to avoid the actual punishment. So if the punishment is something painful or uncomfortable, it allows the dog to avoid that punishment by performing a different behaviour, rather than just giving the punishment without warning. It gives the dog some control over the situation, and this can relieve a lot of anxiety for dogs. Knowing simply that you can avoid the punishment can actually take some of the stress associated with punishment away (honestly!).
More on CP's here:
http://www.phoenixzoo.org/learn/animals/Animal_Training_Protocol_The_Phenix_Zoo.pdf
http://www.wagntrain.com/OC/Part2.htm
http://www.clickertraining.com/node/87
http://clickandtreat.com/Clicker_Training/GG/GG001/GG002/GG003/gg011.htm
In the dog training world, there is also often the distinction between P+ and environmental punishment. When most people discuss P+ in relation to dogs, it usually is a reflection of the human applying some sort of punishment themselves. Why, I don't know, as it's not an exact match to the "Learning Theory", but that distinction is made. Even trainers who use a lot of P+ in training will differentiate between human-applied P+ and what is called "Environmental Punishment", it's sort of......commonly agreed to I suppose you would say (although that's bad, I know). That would likely be why most people don't put environmental punishment under the heading of P+. In terms of strict operant conditioning, though, environmental punishment is a type of P+ (or possibly P-, depending on the punisher), yes. And I have used environmental punishment on occasion, certainly, so I would suppose by the classic literature I can't say that I haven't used P+.
Again, I have no issues with the word punishment. It doesn't hold emotional baggage or any of that. *G* So to say that I use environmental punishment rarely, as a P+, it doesn't hurt my feelings.
But I tend to refer, like others do, to it as environmental punishment to distinguish between punishment applied by the person, and punishment applied independent of the person.