Mind Mirror EEG

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Uniqueness of the Mind Mirrors

The Mind Mirror is an electroencephalograph (EEG) which was first designed in 1976. It performs frequency analysis of signals generated by the brain and displays the results on horizontal barographs as a bilateral hemispheric display. The display panel has two columns of bar graphs which represent the left and right hemispheres (LH, RH) of the brain. The zero signal is displayed by all the indications showing at the middle of the display. Each bargraph represents one filter; if a LH signal is being displayed, the indication moves away from the center of the panel to the left and if a RH signal it moves away from the center of the panel to the right.

The filters which analyze the brain signals are centered on frequencies chosen to give optimum analysis. These are 0.7Hz, 1.5Hz, 3Hz, 4.5Hz, 6Hz, 7.5Hz, 9Hz, 10.5Hz, 12.5Hz, 15Hz, 19Hz, 24Hz, 30Hz, and 38Hz. These frequencies were initially chosen by emperical experience and after some early adjustments with the first Mind Mirror have been kept the same. The bandwidth of each filter is adjusted so that the 3db loss points coincide with the equivalent points in the adjacent filters. This means that a brain rhythm whose frequency lies mid-way between two filters will appear at
a reduced level in both. This disadvantage is balanced by the fact that a signal lying between two filters will not be lost.

The performance of the initial analogue filters was excellent, the rejection of unwanted signals is 50db per octave. Translated, this means that the response of the 9Hz filter to a 4.5Hz signal is reduced by a factor of more than 100 times.

These machines and filter frequencies were the basis of the early work in "consciousness" research by C Maxwell (Max) Cade and its more recent development by Anna Wise.

Brain rhythms respond in both amplitude and frequency to changing thought patterns. Indeed if any frequency is very stable, it seems to indicate a rigid thought pattern which can manifest as a seizure. Cade & Blundell's work suggests, for example, that the alpha frequency of a well-developed subject (someone who is very good at what they do) may average 9Hz but may be varying between 7 and 10Hz. This seemed to be true of all the subjects who excelled: what they excelled at did not seem to be important. They could be yoga teachers, television presenters or healers.

The original analogue filters in Mind Mirrors 1 and 2 were precise but expensive to manufacture. The digital Band Pass filters parameters were modeled on the band pass charactersitics of the analogues filters, and were able to more accurately guarenetee the performance of the filters.

FFT Analysis of Brainwaves

In the early days there was a lot of discussion about the using Fast Fourier Transforms (FFT), which are easy to implement in computer software. Due to the way it functions, this method gives a different pattern to that seen on the Mind Mirror and is not very responsive to the grouping of bands of frequencies known as the beta, alpha, theta and delta responses for a variety of reasons.

Fourier transforms assume an infinite long signal, and the Fast Fourier Transform approxiamates this to about 10full cycles.

The FFT is very good when the signal:

An example of its use is the multi-frequency tone recognition used by older analoge telephone signallin, or radar pulses.

The signal to be analyzed must be of a higher frequency than the sampling window time, i.e., a delta signal of 1Hz cannot be captured (a change of the signal in 1 second) by a sampling window which lasts one second without gross errors occurring. Any system with 1Hz window will be inaccurate below about 3 or 4 Hz.

Visually this can be shown with a "5Hz chirp" simulating an EEG signal. The resultant FFT output is at 2.75Hz with a 0.45output. (thanks to the website dewresearch.com which was used to simulate this signal and output)


Using band pass filters, for a "5Hz Chirp" into an optomized band pass filter - the output below is a sketch of the observed result. That is the filter with its group delay passes the inital peak of the sine wave chirp and a peak detection function detects the maximum amplitude of the 5Hz chirp.

A characteristic of FFT is that it can only generate outputs which are distributed linearly in frequency. If for EEG analysis the window is chosen as 1 second, the frequency "bins" are 1Hz wide from 1 to 40Hz. The relative width of each bin falls with frequency, i.e. from 1 to 2 Hz is a whole octave wide whereas from 39 to 40Hz is only a fraction of an octave. This does not matter if the signal consists of a single tone but when the source is an EEG which is varying continuously in frequency, then this unavoidable change in the relative bandwidth provides another explanation why the beta response is very different with FFT. FFT does not respond accurately to varying or chirpy signals. This is important when reading alpha frequencies which are rarely very steady in amplitude.

If the beta amplitude is large enough, FFT can generate beta readings which are approximately accurate, but the method becomes more and more inaccurate as the beta amplitude reduces. This makes it impossible to use to display Mind Mirror patterns.

To summarize FFT signal analysis:

Uniqueness of the Mind Mirror Pattern.

Anna Wise has been contacted by many frustrated users of FFT systems wondering why they could not see the patterns which she described in her book The High Performance Mind. She says:
"Twenty years’ work with the Mind Mirror has led me to understand the uniqueness of its pattern display and the complexity of the information I gain from it.

People need to know that they do not gain the same information from FFT systems and not realizing its limitations, could lead them to dismiss their own abilities and/or dismiss my years of research as not being replicable."

"Accessing alpha allows the flow of information from the unconscious (delta), through the subconscious (theta), to the conscious (beta) mind. It is this openness or availability of awareness on all levels that constitutes the state Max Cade called an
Awakened Mind. Applying and using and manifesting with this open flow of conscious awareness gives us a High Performance Mind. We have to focus on, find, and thoroughly develop the alpha bridge to allow this to happen."

Geoff Blundell's conclusion: "All the original studies of healers, swamis and anyone who excelled at their job by Max Cade and myself described in his book The Awakened Mind were performed with the Mind Mirror using band pass filters and will not be replicable with an FFT system. "

For anohter part of the uniqueness of the way the Mind Mirror decodes EEG see Contact Placement.