One of the four brain wave patterns, the theta state is typified by patterns that repeat at the speed of 4-7 Hertz (cycles per second). People in deep meditation are in the theta state. It is also the speed of the brainwaves typified by people using their imagination and being creative. The other brain wave patterns are alpha, beta, and delta.
Readers, please enjoy this guest blog post by Sandra Kynes, author of several books, including The Herb Gardener's Essential Guide, Plant Magic, and the new Witches' Encyclopedia of Magical Plants, among many others.
Although a few old books...