mind machines

[Bruno]

A mind machine uses sound and/or light to alter the brainwave frequency of
the user, resulting in altered states of awareness that have been compared
to those obtained from meditation and shamanic exploration.
The process is also known as brainwave synchronization or entrainment.
Mind machines typically consist of a control unit, a pair of headphones
and/or strobe light goggles. The unit controls the sessions and drive the
LEDs in the goggles.
Sessions will typically aim at directing the average brainwave frequency
from a high level to a lower level by ramping down in several sequences.
Target frequencies can be in the alpha wave area in the frequency range of
8-12.
Mind machines are often used together with biofeedback or neurofeedback
equipment in order to adjust the frequency on the fly.
Modern mind machines can connect to the Internet to update the software and
download new sessions. When sessions are used in conjunction with
meditation, neurofeedback, etc. the effect can be amplified.

read on :

http://www.infonosity.be/mentaal/brain-waves-mind-machine.html