>> I still find it astonishing that they can build an amplifying powerful 
>> enough and sensitive enough to detect the absurdly small electrical 
>> currents, diluted across vast distances in space, and yet *not* pick 
>> up the sea of EM interference in the room... Pretty amazing stuff!
> 
> EM (if you mean computers, mobile phones etc) is not the problem 
> generally, mains power supply is.

Yeah, I guess most EM is too high-frequency to interfere with the 
signals of interest... (A normal heatbeat is, what, a few Hz?)

>> No. I'm just curios. (Personally I wouldn't even know a T wave from a 
>> U wave...)
> 
> The T is the slow part after the QRS, the fast part with the highest 
> excursions. The U wave may be after that. It is not present in every 
> lead and not in every person. Frankly, no one knows what generates it.

I find it... uh... "interesting" how many medical effects nobody 
understands. Like, apparently nobody actually knows why menthol works. o_O

>> Sure. But I'd imagine you still need to shave your head to get them 
>> anywhere near your scalp.
> 
> No. small electrodes fitted with conduction glue like material IIRC

...which is what I was expecting for the ECG. But apparently not.

>> Yeah - the soft, tender part in your elbow. What, they couldn't find 
>> anywhere more painful? :-S
>>
> Ah, it seems we have found a biological abnormality here. FYI, in most 
> people the density of nerve endings in the elbow is much less tjan in 
> the fingertips.

See my other reply. Fingertips have to be tough. Elbows don't.

-- 
http://blog.orphi.me.uk/
http://www.zazzle.com/MathematicalOrchid*

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Doctor John wrote:
> Too much information :-)

Also known as "your overshare light is on."

-- 
Darren New / San Diego, CA, USA (PST)

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Orchid XP v8 wrote:
> I believe the distinction of being *the* most sentivite part belongs 
> to... well no, let's not go there... 

You'd be surprised. Google images for "nervous system homunculus".

-- 
Darren New / San Diego, CA, USA (PST)

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Orchid XP v8 <voi### [at] devnull> wrote:
> >   The fingertips are the most sensitive part of the human body. You *really*
> > want blood samples taken from your fingers?

> I believe the distinction of being *the* most sentivite part belongs 
> to... well no, let's not go there... but I believe your mouth rates 
> higher than your fingertips.

  No, I'm pretty sure the skin of the fingertips is the most sensitive of
the human body. I remember reading that (maybe it was from the Guinnes book
of records, or something like that).

  OTOH, it might be talking about other type of sensitivity than pain. For
example, you can read braille writing with your fingertips, but I'm pretty
certain you can't do it with your tongue, even though a cut on your tongue
might hurt more than a cut on your fingertip.

  Anyways, a cut in the finger hurts a lot. It's by far not the first place
I would like a needle to be poked into me.

-- 
                                                          - Warp

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Warp wrote:
> Orchid XP v8 <voi### [at] devnull> wrote:
>> And fortunately, no blood samples required! :-D (Why do they always have 
>> to take blood samples from the most tender parts of your anatomy? Why 
>> not your finger or something? I'm sure it's the same blood...)
> 
>   The fingertips are the most sensitive part of the human body. You *really*
> want blood samples taken from your fingers?
> 

At school we took blood samples from our fingertips. And all
hemoglobin(?) -measurements made for me are done by taking a blood
sample from my fingertip. It's not that bad.

-Aero

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Warp wrote:
> Orchid XP v8 <voi### [at] devnull> wrote:
>>>   The fingertips are the most sensitive part of the human body. You *really*
>>> want blood samples taken from your fingers?
> 
>> I believe the distinction of being *the* most sentivite part belongs 
>> to... well no, let's not go there... but I believe your mouth rates 
>> higher than your fingertips.
> 
>   No, I'm pretty sure the skin of the fingertips is the most sensitive of
> the human body. I remember reading that (maybe it was from the Guinnes book
> of records, or something like that).
> 
>   OTOH, it might be talking about other type of sensitivity than pain.

Possibly.

I understand that the greatest density of *nerve endings* (which doesn't 
automatically correlate with sensitivity) is the clitoris. (If you 
happen to have one. Obviously.) And that's by a considerable margin.

As to which parts have the best spatial resolution, touch / pressure / 
pain sensitivity, etc... well you would probably have a long argument 
about that. Surely your fingertips are high up on the list, but I doubt 
they're at the top. (Although surely higher than your elbow, which is 
the point you were really trying to make...)

> For
> example, you can read braille writing with your fingertips, but I'm pretty
> certain you can't do it with your tongue, even though a cut on your tongue
> might hurt more than a cut on your fingertip.

Funny you should mention that... I read about some people who conducted 
an experiment where patients learned to "see" through their tongue by 
having a set of electrodes connected to it. So merely reading braille 
should be quite easy.

>   Anyways, a cut in the finger hurts a lot. It's by far not the first place
> I would like a needle to be poked into me.

Actually, I'd prefer to not have any needles poked into me anywhere... >_<

I'm sure you'll agree with me on that point!

-- 
http://blog.orphi.me.uk/
http://www.zazzle.com/MathematicalOrchid*

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Eero Ahonen wrote:

> At school we took blood samples from our fingertips. And all
> hemoglobin(?) -measurements made for me are done by taking a blood
> sample from my fingertip. It's not that bad.

Yeah. Unless you play piano.






...oh, wait... o_O

-- 
http://blog.orphi.me.uk/
http://www.zazzle.com/MathematicalOrchid*

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Orchid XP v8 wrote:
> Eero Ahonen wrote:
> 
>> At school we took blood samples from our fingertips. And all
>> hemoglobin(?) -measurements made for me are done by taking a blood
>> sample from my fingertip. It's not that bad.
> 
> Yeah. Unless you play piano.
> 

I've played piano.

-Aero

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On 05-Nov-08 19:24, Doctor John wrote:
> andrel wrote:
>>>> I have electrodes all around the upper body. I regularly shave the
>>>> front and sometimes even the back of very hairy men.
>>> TMI?
>> ?Can't find a relevant meaning for that acronym
> 
> Too much information :-)
> 
That was indeed the most likely one. I reasoned that if it was it was 
probably meant as a joke. Yet, not the kind of jokes Andy normally 
makes, so I was not sure I got it.

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On 05-Nov-08 21:14, Darren New wrote:
> Orchid XP v8 wrote:
>> I believe the distinction of being *the* most sentivite part belongs 
>> to... well no, let's not go there... 
> 
> You'd be surprised. Google images for "nervous system homunculus".
> 
The big question is if these images are made by Americans. If it is 
japanese research I assume you can trust them, if it's dutch it may be 
correct too.

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