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Alternating between focus and open awareness works perfectly well - I mean, as an exercise - but often there's no emotion to process!
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Which leaves me feeling moderately awkward that I just can't conjure up anything to feel upset about, at least in the moment.
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The only thing that seems to work consistently is to spend a lot of time invoking some particularly horrible thing about the world, but...
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... even then, the whole thing becomes rather contrived, turns into more of an exercise in imagination than processing emotion as such.
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Sounds a bit like several practices in the Tibetan models - which can easily be very contrived and mental masturbation, they can also be very powerful and/or liberating, when the conditions are right.
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I've found that when the power of concentration is sufficient, people almost always dig down to strata of mind where material lied ready to be purified, transmuted from poison to wisdom. Not all people are equally traumatised, but everyone has a degree of calcifications & knots.