Where Rigor is Necessary

In certain contexts rigor is simply understood as part of the situation. Mathematics comes to mind. If a famed mathematician claimed that he’d discovered rational irrational numbers (say numbers simultaneously odd and even), the world of mathematics would sadly assume that senility had set it. In other contexts rigor is present in the logical operations, but if no agreement exists about the elements of the argument, so what? Such is the case in philosophy where the crucial issue is agreement on a definition. Suppose a person refuses to accept that there is such a thing as an “accident,” thus that an attribute of something has a different mode of existence than its essence. Such a person might asserts that the redness of this apple and the greenness of that one is, in each case, part of each apple’s essential reality. For that person logical handling of essences and accidents in argument is neither here nor there.

But rigor is necessary for establishing the facts of reality, thus in reaching definitions or in determining the course of a series of events. We expect rigor in scientific and in legal investigations. The interesting difference between the two is that legal investigations are more comprehensive than the scientific. The latter excludes subjective testimony unless it can be corroborated by physical findings; in legal investigations one person’s subjective testimony may be corroborated by another’s; to be sure, the more people corroborate an alibi, for instance, the better. The legal world recognizes the reality of deliberate deception.

In the regions of the borderzone especially—and that region includes the paranormal—rigor is particularly necessary for establishing whatever claims are made. The claim that reincarnation really happens serves as an illustration. There are two approaches, both claiming scientific validity. One consists of the collection of past life memories from individuals and, once these are recorded, work to corroborate them. The corroboration takes two complementary paths. One is the discovery of evidence that the remembered life really did leave something behind. The complement is to establish that the person making the report could not have reasonably learned about that evidence in the course of his or her current life. The late Ian Stevenson (see elsewhere on this blog) undertook such studies. The other approach is to use hypnotic regression. People are put into trances and are then coaxed to “remember” earlier and earlier experience until they pass the threshold of their birth and remember an earlier existence. Once such trance reports are recorded, the corroboration takes the same route.

Now I submit that the first of these methods is at least potentially rigorous. The second contains a major flaw. Hypnosis is very poorly understood and powerfully associated with suggestion. People can be told to do things while in trance, told to forget that they were told these matters, and will then be observed to perform the actions suggested in trance after they are brought out of it. Hypnotic regressions, therefore, cannot be rid of the suspicion that the subject in trance is merely obeying the subtle suggestions of a credulous hypnotist. Now the famous cases of remembered lives all come from the second approach, not from the first. But that’s not a surprise. You might say that it is rigorous proof of human gullibility.