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Experiments and speculation of this type always seem to drift toward an "esp" type of explanation. There is a distinct possibility that the phenomenon is real (I have had this and related experiences, to the extent of saving my and others lives) but do not believe they need to be explained by some psychic power type of thing. The explanation could lie in unobserved physical causes ranging from pheromones broadcast by the starer to sub audible verbalizations the starer is giving that are perceived unconsciously by the staree (so maybe I invented some new words here, the meaning is obvious). It could be that people have unconcious primitve survival mechanisms in place that make themselves almost supersensory in observational powers and that these are unconsciously active or inactive at various times. It's like the well known phenomenon of 'womens intuition' that always seems to let your wife/girlfriend etc. know when you're lying to them. Probably just an innate sense of a combination of pheromones and natural voice stress analyisis that women aren't consciously aware they are doing, just that they are aware that something's not quite right. Laboratory experiments would likely cause these things to be supressed.