kundalini:

Through movement, postures, pressure points, vocalization, and/or breathing, it can be possible to cause the experience of strong sensations in any or all of the perineum, lower abdomen, spine, crown of the head, and brow. Different people might experience this in partial or more complete and stereotyped ways. I personally haven't experienced this, and I tend to think it's a pretty extreme out-of-ordering. In some practice systems and supportive contexts it might be fine, though. I would loosely model it as placing a lot of "pressure" on the system to change, or as creativng a very strong sensational feedback loop. Though, if this had accidentally occurred, for me, I would have used it as feedback loop in the sense that I would heuristically treated a reduction of sensation as more likely to be on the right track, all things being equal. As with muscle tension (described elsewhere in this document) or anything, taking possibly stereotyped action, to narrowly increase the sign of any particular sensation or set of sensations, or as part of any single narrow feedback loop, can potentially take slack out the system in a way that can make it harder to experimentally navigate or backtrack and thereby potentially significantly increase meditation timelines rather than shortening them.

There's nothing super special about sensations in any of these areas, all things being equal, versus sensations anywhere else. They're meaningful, there's certainly correlative structure with respect to body and mind, it's not arbitrary, but, still, they're only meaningful, only generally so, insofar as sensations anywhere else are meaningful.

To be fair, the perineum is a bit special in that it loosely tends to correlate with early in life "stuff," and so on, and later in life tends to go up the spine, and so on, but these "top down" models should be treated cautiously, and the important thing is exquisitely sensitive personal global wayfinding at the finest sensational and temporal grain (speaking loosely, without reifying sensation, temporality, grain, etc.). And the perineum and spine and brow and etc. will intermittently be involved and/lor liminally involved all the time, as much as anything, etc.