More On The pRoshi
It turns out, thanks to research by a fellow traveller, that the pRoshi is apparently no more than a device that plays a sequence of 64 light pulses, taking about 5.68 seconds to complete, after which it simply repeats.Based on the output of the pRoshi, this is the graph that revealed the truth, a plot of one channel output, not the actual output, but rather showing the frequencies in one channel implied by subsequent intervals between light pulses. It doesn't take very long to determine that it is a repeating sequence. This can be seen in the actual output as well.
The frequencies run roughly 6hz to 20hz. I am informed that a circuit to not only do this type of signal, but with a cleaner output, could easily be done for about $25. And even easier to come up with a short file that could simply be played via a light and sound machine.
For use with magstims, the signals don't make quite as much sense, as the magstims transmit the entire signal, not just the positive half of the waveform.
The actual output, recorded via a stereo line run from the pRoshi output to line input, looks like this:
Note: this recording was done via the soundcard, which I should mention is less than ideal. For example, if were to get around to it, I could put up an image showing how square waves show up thru this soundcard. Basically, they get bent a little bit. And I am told that the soundcard is AC coupled and gets rid of the DC offset (if any). But I believe these issues are relatively unimportant. Bottom line - if you play the recording thru a pair of light goggles, the lights look and feel exactly like the pRoshi. The only thing that matters is if the pattern of light flashing is the same.
I've been told that someone has measured the repeating cycle at 7 seconds, I have no way of verifying this, but if true, maybe this could be a parameter that is slightly randomized at startup, which would at least justify some of the hardware. And I'm also told the newer version of pRoshi apparently uses 2048 samples instead of 64.
Below, I dug out an old graph I had of my EEG amplitudes which compares a baseline EEG (heavy black line) with the amplitudes while using pRoshi as well as a few simple non-pRoshi random sessions. The take home point for my sample of one is that there are no significant differences here. For the curious, the pRoshi is the light blue line.
Chuck's response to this page:
From: Chuck Davis Sent: Jun 15, 2008 5:16 PM To: Truth Suxx Subject: Your half vast pROSHI analysis ... Yo, Truth!? I think that I tried to remind you that your so-called analysis, of the pROSHI, was a half-assed attempt to do a rip. If you knew what you were doing you could've done it, but you didn't! If you're trying to be intellectually honest, you have failed miserably. In fact, I would've given you a hi5ive, if you could :) Now, if you think that you have twenty-five bucks worth of brains, then remove it, because it serves only to invalidate everything else, on your mean-spirited website. /ChuckD....I think I'll just let that speak for itself.