Quote:...For the first test i left my eyes open.The last two He said he wanted my eyes closed.Fidgety I opened my eyes and so him making rude faces into a two way mirror...
There may have been a method to your polygrapher's madness, however unscientific. It is just possible that he was making faces in order to see if he could get a reaction from you. Had you shown such a reaction, this would have confirmed that you had not obeyed his instruction to keep your eyes closed. Based on that, he might have inferred that you were likely being deceptive regarding some relevant issue.
A similar polygraphers' trick is described at p. 137 of the 3rd edition of
The Lie Behind the Lie Detector. In this ruse, the examinee is told that it is very important for an accurate test result that he thoroughly wash his hands. The examinee is then told to go to the washroom, wash his hands, and return. Unbeknownst to him, he is observed by the polygrapher (or an assistant) through a two-way mirror. If he fails to wash his hands as instructed, deception may be inferred, regardless of what the polygraph charts may "say."
As for your later question about the meaning of "NDG," I am not familiar with this acronym. Might you have meant "NDI?" This acronym means "No Deception Indicated." AntiPolygraph.org has recently learned of another polygrapher ruse wherein if a subject has passed his polygraph examination, he is informed that the results were "NDI." If the examinee has previously claimed not to have researched polygraphy, he should not know that "NDI" means "No Deception Indicated." The examinee should appear not to comprehend (and the polygrapher is under no obligation to explain) what "NDI" means. But if the examinee breathes a sigh of relief, it would tip the polygrapher off that contrary to the examinee's denial, he had, in fact, researched polygraphy and falsely denied it. The polygrapher might then further infer that the examinee had also employed polygraph countermeasures.