And what parts of the brain are used during conversation? I'd be
wanting to know that before I drew any conclusions about anything.
(Sorry if someone has already covered this, I'm way behind....)
Julia
[EMAIL PROTECTED] wrote:
It isn't whether it can penetrate it is how much penetrates, what is the energy of the penetrating em signal and where the penetration occurs. The study does not by the way prove that the em signal penetrates into the brain; the TMS signal may be affected by superficial stuff so the phone em signal may alter superficial processes such as blood flow. In any event the energy necessary to affect the electrical activity of neurons is very different than the energy necessary to induce cancer. The neurons are always exposed to chemical and em signals - EEGs are recordings of the electrical activity of the brain. These emission don't cause cancer or we would all have brain cancers (come to think of it there would be no "we all" in any sense if low level em caused cancer).
-----Original Message-----
From: The Fool <[EMAIL PROTECTED]>
To: [email protected]
Sent: Mon, 26 Jun 2006 08:28:15 -0600
Subject: Cell Phone Signal Excites Brain Near the Cell Phone
What was that about cell-phone radiation not being able to penetrate the
skull again?
<<http://msnbc.msn.com/id/13550265/>>
Cell phone signal excites brainås it harmful? Repeated exposure could have
possible effect on certain people, study finds
WASHINGTON - Cell phone emissions excite the part of the brain cortex nearest
to the phone, but it is not clear if these effects are harmful, Italian
researchers reported Monday.
Their study, published in the Annals of Neurology, adds to a growing body of
research about mobile phones, their possible effects on the brain, and
whether there is any link to cancer.
About 730 million cell phones are expected to be sold this year, according to
industry estimates, and nearly 2 billion people around the world already use
them.
Of these, more than 500 million use a type that emits electromagnetic fields
known as Global System for Mobile communications or GSM radio phones. Their
possible effects on the brain are controversial and not well understood.
Dr. Paolo Rossini of Fatebenefratelli hospital in Milan and colleagues used
Transcranial Magnetic Stimulation or TMS to check brain function while people
used these phones.
They had 15 young male volunteers use a GSM 900 cell phone for 45 minutes. In
12 of the 15, the cells in the motor cortex adjacent to the cell phone showed
excitability during phone use but returned to normal within an hour.
The cortex is the outside layer of the brain and the motor cortex is known as
the "excitable area" because magnetic stimulation has been shown to cause a
muscle twitch.
Mixed results
The researchers stressed that they had not shown that using a cell phone is
bad for the brain in any way, but people with conditions such as epilepsy,
linked with brain cell excitability, could potentially be affected.
"It should be argued that long-lasting and repeated exposure to EMFs
(electromagnetic frequencies) linked with intense use of cellular phones in
daily life might be harmful or beneficial in brain-diseased subjects," they
wrote.
"Further studies are needed to better circumstantiate these conditions and to
provide safe rules for the use of this increasingly more widespread device."
Medical studies on cell phone use have provided mixed results. Swedish
researchers found last year that using cell phones over time can raise the
risk of brain tumors. But a study by Japan's _four mobile telephone
operators_ found no evidence that radio waves from the phones harmed cells or
DNA.
The Dutch Health Council analyzed several studies and found no evidence that
radiation from mobile phones was harmful.
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