Book Excerpt

In certain respects, the evidence for psychokinesis is similar to that in the case of an unsolved crime. We must determine whether it is reliable, and then decide which clues are important and what they point to. But that is no small task, considering the amount of material and the diversity of its sources and details. So it is no wonder that a central problem in assimilating the evidence is to determine what its underlying regularities are. After all, even the great physical mediums differed widely in their range and repertoire of phenomena and in their modus operandi. And poltergeist cases differ from these in numerous and possibly relevant respects. Hence, one major job for the theoretician is to determine what such differences indicate about the nature of PK, and whether the differences are linked by deeper regularities.