Dual B B

[Rob]

Hi there,

I notice the dual bb checkbox, which I assume gives us the function of a secondary binaural beat.



If so, how do I control the frequency of this?

Cheers
Rob

[TheRock]

Hi Rob,

Here's a brief explanation on dual binaural beats.

Checking the "Dual B B" box sets up a dual binaural beat. The first binaural beat is the same as a single BB...the left ear runs at the "Sound Pitch" rate and the right runs at the "Sound Pitch" rate plus the "LFO #1". The second BB is similar to the first but will follow LFO#2. Also, the base frequency of the 2nd BB is a harmonic of the "Pitch" frequency. This ratio can be set using the "Edit Supplemental Commands" option under the "Utilities" menu. You can set the ratio of the base frequencies to 1/2, 2/3, 3/4, 4/3, 3/2 or 2.

To update the default setting in the Proteus check the "Update default settings" box, and with the Proteus connect to your PC and in the "PC" mode, click on the "Send to Proteus" button.

As an example. Say your Pitch was set to 120 Hz, LFO#1 set to 8 Hz, LFO#2 set to 12 Hz and a BB2/BB1 ratio of 3/2 (1.5). Then in the left ear the base frequency for BB1 (120 Hz) will be generated along with the base frequency for BB2 (120 Hz * 1.5 = 180 Hz). In the right ear the binaural frequency for BB1 (120 Hz + 8 Hz = 128 Hz) and BB2 (180 Hz + 12 Hz = 192 Hz) will be generated.

You can also insert "Supplemental Commands" into a session which allows you to change the BB2/BB1 ratio on the fly.

Best regards,
theRock

[NeuroGardener]

How can a double binaural beat be produced?

I understand that the single binaural beat is formed from the difference between the pitch from left vs right, but how can you form a new second one without lossing the first one? Of course, this is based on the assuption that you can only use one pitch per ear...

[Rob]

HI,
Thanks for the reply TheRock! Apologies for the belated response.

The dual binaurals work well. So long as the pitches generating each binaural frequency aren't too close together then it works just fine. the brain picks up both just fine.

Robert Monroes Hemi-sync technologies use them to great effect.

There is an brief explanation here with some other useful tips :

http://www.mindmachines.com/AVsJourn...SoundTerms.htm

All the best

Rob

[Robert Austin]

Yes, dual BB's work best if the beat frequencies are harmonically related, for example:

left right

400 404
400 408

In this example the beat frequencies are 4 and 8 Hz. Note that there should be a monoaural beat in the right side, but it is also 4 Hz.

We did some preliminary laboratory experimentation when Dr Budzynski was running a research project for us some years back, and it appeared that dual and triple BBs produced much lower EEG amplitude shifts than single BBs do. This was done with just three subjects, however; if anyone knows of studies done with larger groups, please let us know!

Robert