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Topic: GKT

Barry C
Member

posted 07-27-2007 04:52 PM

Dr. Vrij told me about a the SARMAC (www.SARMAC.org) conference right here in my own back yard. Until he told me - from the Netherlands no less - I didn't know SARMAC existed. Now I've joined so I can at least get their journal, but I digress.

Anyhow, one of Dr. Vrij's students presented on using eye blink rate as a means of performing the GKT. The presented paper hasn't yet been published, but I'll keep my eyes open for it. (Or, I'll try to hunt down the lead researcher tomorrow at the conference.)

What they've found is that eye blinking decreases at the presentation of the key item. They believe it is due to an increased cognitive load (based on other research), but as one person pointed out (I don't recall who as it's literally a who's who of some of the best researches in the world at the conference) there doesn't appear to be much of a cognitive load when a person is presented six items and is instructed to say "no" to it.

They made no mention of the OR, and that particular scientific community gives little credence to FFF in most detection of deception situations.

It's got me doing a lot of thinking right now, but I've got to think a few more things through before I comment too much. In the interim, I just wanted to pass it on as I know there is much interest in GKTs in the polygraph world.

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blalock
Member

posted 07-28-2007 09:17 AM

This sounds interesting! Interestingly enough, while two examinees this week were taking exams, both were NDI, but I could have sworn that I noticed their eyes widen more than normal at least one time while answering (or just before) comparison questions... Hardly concrete, but I am going to pay a little more attention to this to see if there is some sort of trend. I don't think my video is going to be clear, but I'm gonna check it out anyway...

Ben

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