Ramps

Well, as promised, here’s the full detail on the “followed ramp”.

EEG-18-12HzRamp

As can be plainly seen, there is a very nice trace of activity tracking from 18Hz down to 12Hz.

Robert Austin says, “The stimulus was red lights via MindLab, plus steady binaural beat from the same platform.  And the two channels were CZ and O1…  interesting that the CZ amplitude was higher than O1. The ramp was from 18 to 12 Hz though I don’t recall the time period involved right now.  There was also a steady binaural beat at 8 Hz during the photic ramp, which shows up as well… in fact this EEG neatly demonstrates the efficacy of the two forms of stimulation to elicit EEG activation, I think. I’ve gone through the batch of SynchroMed experiments I have in the office, but they are all done with the Neurosearch 24 as session averages (interesting in their own right, will have to scan and upload… when I have some spare time…).  The other EEGs which also showed a similar activation during ramping are somewhere in storage, alas, as are the ones showing that it was possible to elicit three separate (non varying) EEG frequencies, that were not harmonically related.”

Now, however, I’m going to get completely pedantic and stand by my assertion that an entrained brain does not follow ramps. This is not to be confused with the idea that a brain may well follow ramps by mechanisms other than entrainment.

Entrainment relies on rhythms of the brain picking up on and synchronising with a repetitive beat. The key element is isochronous repetition – the time between beats must be the same over a reasonably extended period for true entrainment to occur. A ramp, by its nature, is not isochronous. A ramp will have each period between beats shorter or longer than the one before – this leaves nothing to entrain to.

The idea that EEG responses that are not directly related to the physiology of entrainment is key to the effectiveness of many complex sessions. I have found that by paying attention to one element in a session rather then another, the experience can change significantly. I will certainly reconsider the merit of using ramps.

Anyway, many thanks to Robert for bringing to my attention another little gem from his archives. It’s well worth spending some time on the MindPlace site looking at some of his research material.

Cheers,

Craig

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