Gold Meritorious Patron
Ummm. The 'cans' can pick up *optical* stuff? Gee. Then maybe they should be painted with lowrider black primer before we 'test' them. Although, that might affect the 'conductivity'; unless it was pure *carbon* lampblack...
What the hell is this 'Oxuplse'? Is this something only 'nurses' know about? The thing being 'measured' in the $0.29 fingertip thing you pictured is the changes in IR levels between a tiny LED sender on one side and an equally tiny LED receiver on the other, which uses a leading-edge difference to *count* pulses. There's no such thing as a 'pulse ox' level.
How much oxygen is in the blood *doesn't matter* You could use the same sensor on a *dead* body and just rythmically jump on it enough to change the *optical* distance between the fingertip LED sender and the LED receiver.
You could attach *battery cables* to the toes and it wouldn't change the *optical* characteristics.
Holy Fucking Christ.
Jesus H Christ.
Zinj, I'm very disappointed that I have to explain that again.
The argument is not about the oxygen in the blood, nor the cans picking up optical stuff. The point is that there is a MEASURABLE pulsing due to the variation in size of the capillaries in the tip of the finger, just like you can measure your pulse manually at the wrist. This pulsing changes the contact patch area and quality of the skin to can interface.
My point by bringing up the Pulse Ox is that a cheap plastic disposable sensor can pick up your pulse at the tip of your finger. That's a fact. There is a pulse there and with all 10 or 11 of YOUR fingers on the cans at the same time, it's very likely we'll see that effect. I had assumed that this could be a measurable effect, and the Pulse Ox example shows that it can easily be measured.
Also a different effect is the electrical current going to the heart. That can easily be picked up by other medical instruments. It's also likely the e-meter picks that up.
Combine that with micro muscle twitching, the involuntary ideomotor effect, Galvanic Skin Resistance changes, sweat variations, can lead tugging, you have 7 different types of phenomenons that could combine and make noticeable reads.
I predict that we will see some of those using proper experimental controls, that isolate out the other effects. For example the needle test could show the heart electrical signal, because most of the other effects are effaced.
We already saw the needle hardly moves compared to a LOT of motion with dry hands. That is where I DEBUNKED the E-Meter. Face up to it.