Ah I think I see what you mean.
Just to clarify, a positive reinforcer is the reward for a behavior, which will cause that behavior to be repeated in hopes of the reward.
A negative reinforcer is the ending of something unpleasant, often called "release of pressure." If I keep poking you until you move away, and then the poking stops, you have been negatively reinforced to move away. Next time I poke you, you learn to move away faster to avoid the pressure. (Assuming you don't deck me.

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(Aside: Most people think negative reinforcement=punishment, but it isn't the same thing in behavioral terms. One of the many confusing things about behavioral terms.

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Quote:
Receptors are not hypersensitive forever after discontinuing NAL. So while there is a period that negative reinforcers should be avoided, it does diminish.
I was confused because I think maybe you said reinforcer when you meant behavior in the above quote? Exercise, etc you are calling positive behaviors. Drugging etc you are calling negative behaviors. So you are using the words positive and negative as values, rather than to describe reinforcers.
If so, you are saying that while the receptors are supersensitive and presumably strongly rewarding any behavior that takes place in that state, then negative BEHAVIORS should be avoided so that they are not positively reinforced.
Am I getting it right?