Re: ? Bipolar Montage Fz-A1-Cz-A2, help!

[Guest guest]

Mike,First:  Fz/A1/g/Cz/A2 is NOT a bipolar montage.  It is a 2-channel montage (each of the channels is monopolar, since it has a reference over a relataively inert EEG area--the earlobe).  Fz/Cz would be a bipolar montage in one channel, since both the Active and Reference leads are over active EEG sites.

Second:  Training coherence doesn't necessarily change phase.  Phase is a measure of the timing relationship between two sites.  When the peaks of the two signals occur at the same time and the troughs occur at the same time, the signal is " in phase " , which a small phase angle (say between -45 and 45 degrees).  Coherence is a measure of the stability of the phase relationship.  Two sites could be completely out of phase, 180 degrees off from one another, but if they STAY 180 degrees apart, they are coherent.

Third: If you want to train to reduce the Theta/Beta ratio, why not just train to...well...inhibit theta amplitude and reward beta amplitude at those sites?  Using something like the Options--2C design, inhibiting 2-9 or 2-6 Hz in each channel and rewarding 13-21 Hz in each channel would do that.

Pete-- Van Deusenpvdtlc@...http://www.brain-trainer.comUSA 305 433 3160BR 47 3346 6235

The Learning Curve, Inc.

On Sun, Nov 20, 2011 at 1:12 AM, chiapetfarmer <chiapetfarmer@...> wrote:

 

Hi All,

Do I have this right:

High Theta to Beta Ratio at FCz (High Theta Amplitude and Low Beta Amplitude-training an Adult)~Am I correct that the amplitude of theta waves will decrease if I train for coherence (in-phase) of theta waves in a bipolar montage Fz-A1-Cz-A2?

[Guest guest]

Hi Pete,

Thanks for your long-suffering-I just want to make sure what I got after

listening to some Neurofeedback Training was correct:

If you had trained in monopolarity at sites Fz and Cz, at separate times for a

few months, and you found that the Theta and Beta amplitudes flat-lined after a

time, could you train Fz/Cz in a bipolar montage, training theta for in-phase

(by training theta for phase, the theta waves will cancel out between these

locations due to common-mode differential and fast waves will naturally

predominate), in the instance where you know that there is a marked difference

in amplitudes between theta and beta (high amplitude of 13uv for theta, for

instance, and low amplitude of 4uv for beta)?

Just trying get my arms around this!

Mike

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> > **

> >

> >

> > Hi All,

> > Do I have this right:

> > High Theta to Beta Ratio at FCz (High Theta Amplitude and Low Beta

> > Amplitude-training an Adult)~Am I correct that the amplitude of theta waves

> > will decrease if I train for coherence (in-phase) of theta waves in a

> > bipolar montage Fz-A1-Cz-A2?

> >

>