I typed out a whole long reply and my browser deleted it, I'm a little frustrated now so this is going to be a bit more terse than I originally planned :p
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I don't have a Q.Wiz, I actually bought a J&J I-330 C2+ for Biofeedback, the temperature sensor looks like this:
http://imgur.com/zXimPEC
The two snap leads are for SR, and the third black cord ending in a slight bulb is the temperature sensor. You just tape that to a finger or nostril. Physiopilot also makes biofeedback instruments, you could look at their catalogue if the Q.Wiz doesn't have an equivalent sensor.
For designs I'd look at Glyn Blackett's designs, he's all about using biofeedback for mindfulness practice. Itallis also has some biofeedback designs for sale, too.
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I think a lot of things can correlate to concentration practice, if the measure is responsive and relevant enough to whatever it is you are doing, your mind will naturally pay attention to it and use it as a guide about whether you're on task or not. I'm not sure if there's any design that really specifically targets concentration meditation, though. I actually think that tranquillity/concentration most naturally follow from working with the body, so the stuff we're discussing with biofeedback is probably the most useful.
What entropy is useful for is noticing the split second where a thought becomes attachment. When I'm training entropy I'm constantly abandoning thoughts, basically what it lets you do is notice the gap between the initial thought, and your mind seizing the thought and running with it, and once you notice this gap you can 'slide the knife' and separate the two occurrences. And in some ways that's more impressive than developing concentration, because it is pretty subtle. You can use it to develop concentration, but I think in a way it's kind of backwards, because it's examining tension and stress on an even subtler level than you would use to develop concentration. It's in the same spectrum, but it's its own process.
For sites I just use the same ones I use to train TAGsync, fronto-parietal sites, with the rationale being that I'm covering more 'global' brain activity that way.
I'm not sure what to do if your entropy or alpha are high, mine seem really average.
Alpha I just thought would be useful for maintaining continuity of awareness while doing entropy training. For me it's like a 'stepped down' version of TAGsync, so I'd use it just to retain continuous awareness as the mind settles down, I don't think it's actually that important, just sort of a safety net to prevent mental dullness (for me at least, ymmv).
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TAGsync itself doesn't correlate to insight practice. In a way it's more concentration practice, it's just that you're concentrating on your awareness or consciousness. The first three tetrads in anapanasati (which I recommend looking to as a general guide anyways) that is those of body, feeling, and consciousness; when you look at these processes they're all about calming down these processes so as to eventually apply them to insight in the fourth tetrad. So mindfulness of consciousness (and by extension TAGsync) leads directly into insight, but it isn't itself insight.
The difference is you have to be able to perceive your awareness with enough fidelity to directly witness the mind as impermanence. That is insight practice, and I don't think there's any design to help with that, just work with the fundamentals via TAGsync until it happens.
Things like the breath slowing down are common, but they're generally intermittent. What we're trying to do is make them fall under our skill so they're consistent. Refining the breath process until it naturally slows down is one way of doing that, and a breath sensor might help just in giving some objective feedback in how you're doing with that. 1bpm is often a sort of benchmark that people describe, that's not doing it by force though, basically just investigating the breath mechanics and calming every inefficiency in breathing until it happens on its own naturally.
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HEG is fine to train if you're not consciously intending to make your gain go up in a very vigorous way like standard HEG training (I think that's what you mean by passively), so no I wouldn't do the regular kind of HEG training on a regular basis, but if you approach it more gently it can still be useful.
I don't think posture itself is that important, you just want a stable and relaxed posture (so you can 'forget' your body and not worry about toppling over), that also encourages alertness, anything that will do will do. The only reason people talk about the lotus posture so much is that your body is literally a tripod, so it's very stable, but most westerners aren't going to be able to pull it off and it really isn't essential, I personally sit seiza most of the time.
Generally, I'm operating from this understanding as a rule of thumb:
Mindfulness of Breathing develops sati (which you could consider 'heedfulness'), which counteracts sense desire.
Mindfulness of the Body develops samadhi (which you could consider 'concentration'), which counteracts restlessness and remorse.
Mindfulness of Feeling develops viriya (which you could consider 'effort'), which counteracts sloth and torpor.
Mindfulness of Consciousness develops saddha (or 'faith), which counteracts ill will.
and Mindfulness of Mental Events (dhammas) develops panna (or wisdom) which counteracts doubt.
Mindfulness of Breathing you can consider the binding practice that balances and links the latter four together, that's why it's amenable to sati which is the balancing factor of the five indriyas, or certainly that's how it's used in the four Anapanasati tetrads.
Edited by umop 3pisdn, 09 November 2015 - 08:04 AM.
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, not sure but it was strange, and good feeling I think).
