The lower chakras seem to be associated with the animalistic body, while the heart chakra and above are associated with the spiritual soul. The heart chakra in particular seems to be associated with a feeling of lovingness and union.
I do remember when 'kundalini' shot through my spine, it was like being bolted by lightning. It threw me completely into a wild, rude shock to the core of my system. It came so quick that I could not even know which direction the jolt was going - upwards? downwards? I don't think it really mattered, but I started seeing many faces, saw kaleidoscopic visions, almost like I was on an acid trip. Until now, I still have no idea how the kundalini (if you call it this) is associated with the jhana-nimittas, which seem to be a different experience for me. How exactly is kundalini and the holy spirit associated - are they the same thing, because it does feel different in experience to me