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Wow, I like the references to the studies, thanks.
I wonder, though, if there isn't a more general principle of concentrating on something on alternate sides of the body causes activation of the appropriate side of the brain. I don't know that the results can show that it's, um, specifically some special nasal ability in humans.
What about any other rhythmic activity that alternately engages each side of the brain? Lifting the index finger in time, or tapping a foot, blinking alternately, that sort of thing. We already know that blinking lights in the left and right visual field seems to cause altered neurological states(hello, Pokemon, I'm talking to you, too). Breathing through alternate nostrils might be engaging an altered neurostatus in the same manner.
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