antrella wrote on Mar 7^th, 2006 at 10:11pm:


In A 1993 article on CM's, Honts stated that tongue biting reduces the "efficacy" of polygraph data by 
"75% (from 98%) down to 24%". - (Read it in an APA journal. )

antrella

Mine is a restart. I don't know if any other type exists. I didn't notice any other on the shelf.

Twoblock wrote on Mar 8^th, 2006 at 9:08pm:


Twoblock - I assumed it was something along these lines. As for a digital BP machine, do you know of one that provides a realtime/streaming heartbeat/BP? Or do they all simply deflate and require you to stop, restart, stop, restart, etc. Thanks-

antrella

I'm not a polygraph expert but, bite your tongue hard enough to cause pain. Pain causes a rise in BP and heart rate which in turn causes an increase in sweating.

To prove this to yourself, buy a digital BP machine with pulse indicator. You can test your anal squeeze and how well you can controll you thought processes. With this machine, you have to hold your thought process or squeeze until the pressure is released not just the 5 to 8 seconds required for the poly.

I have no stock in the company/companies that make the devise.

antrella wrote on Mar 7^th, 2006 at 10:11pm:


I'm surprised that no one has stepped up to explain the physiological basis for tongue biting as a CM. Relying on it blindly is just as bad as relying on the poly blindly. I'm not content with the knowledge that "it works," and would definitely like to know why it works, and which physiological mechanisms are affected.

Perhaps I could just slide my tongue between my teeth and just worry about being caught?

Breathing manuevers aside, for the most part, the only concern an examinee has is the involuntary changes in electrodermal response. I understand the methodology of the tongue-biting CM - namely that you want to cause a reaction during the controls that is greater than the reaction during the relevants - but what I'm curious about is the physiological connection b/w tongue-biting and heightened electrodermal reactivity. The connection is self-evident when considering mental CMs (i.e., math equations=sweaty palms) - but tongue biting seems to me as inexplicable as the old 'tack in the shoe' trick. 

Would someone care to shed light on how it works? Perhaps with a clear understanding of the "how," one can develop more sophisticated, perhaps more potent CMs.