wrote on Jan 3^rd, 2003 at 2:53pm:

Dear Marty, Looking for "signatures" of countermeasures is an interesting idea but I would argue that many autonomic nervous system traits would give consistant signatures which many polygraph experts associate with "truthful" reactions. Regards.

I believe some of these signatures are differential, in that they are distinct from CNS controlled autonomic responses. I think this is dependent on the type of countermeasure.  Drew's challenge, and other comments in the literature, aludes to this. This is one reason I believe research here would be more productive and cheaper.

Also, Drew has stated he had at one time believed that more channels would provide higher polygraph reliability but has concluded the additional information is redundant and of little value. The same may not be the case re some types of CM detection.

Agreed. If anyone wants to discuss detection of CM's specifically we should start a thread specifically on this. Just wanted to clarify I was not talking about general polygraph measurements and DI which I think are close to impossibly complex.

-Marty