I think this is called the Schumann Resonance Frequency.
I've created a few SBaGen programs that explore this frequency range. A lot of friends find it relaxing, I also had it running as part of an art exhibition a few years back.
I think because its the easiest form of "relaxation" without things getting to extreme or weird for them.
Some interesting observations here Jim.
On 30 Nov 2009, at 07:35, Jim Peters wrote:
> Reading Carl Johan Calleman's books recently, he has made a connection
> between brain-wave frequencies and the radius of the earth, and the
> various distinct layers inside and outside the earth.
> It takes about 0.133s for light/radio waves to travel around the
> circumference of the earth (e.g. the equator). This gives a standing
> wave frequency of about 7.5Hz.
> Calculating this frequency at different radii related to the earth, we
> Magnetopause: 0.8Hz
> Outer Van Allen belt: 2Hz
> Inner Van Allen belt: 4Hz
> Surface of earth: 7.5Hz
> Outer core: 13.5Hz
> Inner core: 40Hz
> It is interesting how these correspond to brain wave frequencies. So
> alpha waves resonate with the area from the surface down to the outer
> core. Beta is outer core to inner core. Theta is earth out to the
> inner van allen belt, and so on.
> These correspondences are very interesting. This means we are
> resonating with the inner core of the earth only at very high (gamma)
> brain frequencies. Sometimes when I am concentrating very hard, I get
> a 'noise' in my head like "ping-ping-ping-ping...", like a metallic
> resonance, when my brain is really in overdrive (e.g. if I am under
> very great pressure to work). I wonder whether this is like a
> 'ringing' sound, like when you hit a metal object and it rings, like
> resonating with the big iron crystal that is supposed to be in the
> centre of the earth.
> So, intense focussed concentration resonates with very dense objects
> (earth core), and relaxation/sleep resonates with large and
> low-density objects (van allen belts/magnetopause). Every day we
> cycle between the magnetopause and the inner core of the earth. (This
> is a little like what I was suggesting in the theory2.txt file.)
> I wonder what the implications could be of this?
> P.S. In some way this is backwards to me, because I associate very low
> brain-wave frequency with body-centred awareness, i.e. shifting the
> point of attention down to the belly. I associate higher brain wave
> frequency with head-centred awareness, i.e. upwards movement. But
> according to these ideas, low frequency resonates with stuff which is
> 'up there', i.e. van allen belts/whatever, and higher frequency
> resonates with stuff which is down under our feet. I have to imagine
> myself standing on my head to make this seem right.
> Jim Peters (_)/=\~/_(_) jim@...
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