Re: Visual comprehension and reading

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Article #602

#602

From: codyfrew
Date: Thu, 08 Mar 2007 22:48

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On Mar 8, 4:58 am, "CB" <caldwell.brob...@gmail.com> wrote:
> "codyfrew" <codyf...@gmail.com> wrote in message
>
> news:1173350180.299352.23830@t69g2000cwt.googlegroups.com...
>
> >   Headaches are not in your brain. You are feeling pressure from
> > sensory cells around your arteries along the outer lining of your
> > brain.You have veins and arteries all around your brain, and even
> > within the crevices and folds that you cannot see form the outside.
> > BUT, they never actually break the barrier.
>
> How sensitive are these nerve cells? IIRC (not my field at all), brain
> activity is linked to heightened blood flow to an area; so if (big if) the
> nerves were sufficiently sensitive then they should be able to indicate
> which areas are receiving more (or less) blood, which then gets interpreted
> as feeling an area to be more or less active?
> Just curious,
> CB

Yes, blood flow IS indeed linked to brain activity. But you cannot
sense bloodflow. You have some sensory receptors that can deduce
pressure, this signifiying pain for a headache, but to be honest there
is still little known about headaches and the nerve cells that are
responsible (let alone how sensitive they are). And even still, there
are a lot of brain mass that doesn't directly interface with blood
vessels.

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From: "codyfrew" <codyfrew@gmail.com>
Newsgroups: sci.cognitive,bionet.neuroscience,rec.arts.fine,sci.lang
Subject: Re: Visual comprehension and reading
Date: 8 Mar 2007 14:48:13 -0800
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