You can produce physiological reactions by using only your mind (think of how feel when you almost trip, or get that "scared" rush). Thoughts that produce those feelings cause enough physiological changes (blood pressure, heart rate, GSR) without having to revert to overt physical measures (anal pucker).
Sit in a chair, relax, and think, "Oh my God, I'm on fire." You can produce that little rush at will, and that's all it takes to beat the polygraph. Pick a control question to spike, make up a good story about why that question bothered you, stick to it, and don't cave in from any guilt you may have about having used CM's. Stick to your story, be consistent, and act sincere.
The seat sensor is a prop. Sure, it may detect shifts in weight, but so what? Whether the sensor is hooked up to the computer or not, don't let it deter you from using CM's that are internally generated or produced. All the polygraph does is detect changes in your state of being. Not to be crude, but let's say during a panel of questions, you feel the mother-of-all-farts coming on. What are you going to do, Ranger? Let it rip or hold it in? So that's your alibi for any claims that the seat sensor "detected" your employment of a countermeasure. I seriously doubt a polygrapher is going to say, "You go ahead and fart next time, let me worry about the smell."
The bottom line is this: you can control how you react to questions. If there is a relevant question you have to lie about, practice asking yourself the question and giving a response so you become desensitized to the question. The polygraph, as related to the art of lie detection, is a fraud.
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