What, if anything, can/should spirit mediums pick up on with regard to rifters?

If it helps, they’re able to sense the presence of spirits, communicate with them better than most people, read their minds, etc. They also hear lyrium’s song very loudly when exposed to it, but not processed lyrium—like they don’t hear humming from Templars or anything like that. Obviously to whatever extent rifters are spirits, reading their minds and being able to tell them what to do would be OP, so I’m mainly wondering if there’s a faint spirit sense tingling-in-the-back-of-your-neck thing going on or not.