Shamanic rattle, shaker, noise maker— no matter its moniker, this sacred tool is a valuable ally in a shaman healer's intention of service through sacred rhythm. Like a shaman's drum, the rattle
is used to aid in achieving the "altered state of consciousness," (ASC), that brainwave frequency measured between 7-8 Hz which is the threshold to journey work,
reportedly in the Theta/Alpha range. That is
roughly the same as the Earth’s natural frequency, known as part of the “Schumann Resonance” frequency range that I’ve written about before. The lowest in the range, according to Wikipedia, is 7.83 Hz.
But here’s something new to add.
I know this is tangential to my subject, but it’s so cool. You can actually hear Mother Earth’s heartbeat, which is caused by lightning. There are a lot of scientific / government organizations and agencies monitoring the Schumann, but you can eavesdrop several amateur radio buffs' sites who live-stream it. Here's a site that features a round-up of amateur monitoring stations around the world. Very cool! Associated Websites are also listed so you can learn more.
You can also see near real time lightning strikes on a map from this monitoring site at the University of Washington. (An updated real-time map here, too.)
Estimates are that lightning strikes the earth about 100 times a second from an average of around 2,000 thunder storms occurring on the planet at any one time. That translates into more than 8 million strikes a day! And that is what helps produce the Earth's measurable heartbeat at 7.83HZ, the same frequency you need to enter into the altered state. But don't worry, you won’t need quite that many beats on a drum per second to do so!