All about the 4 biofeedback modes and the two methods to do biofeedback with.

Biofeedback is very straight forward when you break it down like this.

All biofeedback scans will scan a set of frequencies. You have 4 modes which consists of two operations -- scan the frequency and optimize the frequency.

NOTE: Optimize is useful for frequencies below 4000 Hz, and not necessary for frequencies above.

* No Frequency Programs loaded required for the first 2 modes.

1. It will scan ONLY the range defined - a regular biofeedback scan (Single Scan Checked).

2. It will scan the range defined and then it will do a second pass of the frequencies found, to optimize +- 1 Hz of that frequency. (Single Scan Not Checked).

It will take nearly as long to optimize 20 frequencies as it does to scan 3800 frequencies -- so this doubles the time of the default scan.

* A Frequency Program(s) is loaded and required for the next 2 modes.

3. Optimize Scan (Grade Program Unchecked). Scan +- 1 Hz the frequencies loaded and return the best result for each frequency.

As you can see Optimize scan can be isolated if you provide a list ahead of time, otherwise it would have to scan the range first to find what to optimize (Mode #2).

4. Grade Scan (Grade Program Checked). You can change the behavior of the optimize scan to only grade the frequencies loaded. Returns the loaded frequencies ranked from best to worst response. Does not guarantee top frequencies are efficacious or appropriate to the target.

* All four biofeedback modes can be done on the XM using the Pulse, or using the GX using the Pulse. With the GX you have access to the new faster current and angle based scans.

* Modes 1 - 3 can be done with the GX using the new current and angle based scan.

* Mode 4 (Grade Program) is best reserved for the Pulse. If you wish to use it on the GX, stick to current as the method of analysis.

Here is the reason why.

If I were to grade the following 3 frequencies: 10, 10000, and 2,500,000...

Using the pulse, the heart is plodding along. When you send in 10 Hz, the heart reacts, and we know how you responded. Same with the following two frequencies. The baseline is the heart.

When I grade using GX's new scan method, 2,500,000 will always rank highest.

The reason is that as frequencies rise, so does current and angle (phase). There's no baseline to normalize all 3 frequencies against each other.

The measurement difference between 10000 and 2,500,000 is going to be so great that it will make 2,500,000 stick out compared to 10. 10 will rank at the bottom because it was the starting frequency for which there's no data to rank it against.

Angle (phase) based measurements will scale faster with higher frequencies than current does.

If you still must grade with the GX's new scan method, stick to current.

This is not an issue for a normal biofeedback scan, as you are checking each frequency in a linear fashion. The baseline is the frequency prior, which eliminates the angle/current measurement curve as a factor.

However, I then must ask you, with the ability to scan 41 kHz to 18 MHz in 6 minutes, why are you wasting time grade scanning on the GX?

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