Duane and Behrendt later admitted, among other things, that because the twins were not in shielded rooms, they could conceivably have sent coded signals to one another. "In retrospect, the biggest defect in our experimental procedure was that we did not rule out completely conventional forms of communication between the twins, and we did not perform a statistical analysis to eliminate spontaneous alpha rhythms." While they continued to seek the "hard, quantitative data" they said would prove or refute the hypothesis, neither these authors or anyone else has succeeded, during the intervening 45 years, in replicating these results under scientific conditions.
In his book The Conscious Universe, Dean Radin remains optimistic that, correctly interpreted, the experimental outcomes of parapsychological experiment conclusively demonstrate the existence of psi or ESP.
But if the century and a half of psychical research has taught us anything, then the next generation will likely not be able to replicate Radin's presentiment results and will begin to search elsewhere for their elusive quarry. On the other hand, if history ceases to repeat itself, future parapsychologists may very well find ways to help us develop our intuitive powers; it remains to be seen whether Radin's research will pave the way.
