Is psi research fundamentally flawed? (The meta-debate)

This meta-debate is the most consequential in the field because it determines whether psi research is capable of producing reliable knowledge.

The strongest pro-psi argument is Cardena's (2018) The Experimental Evidence f... American Psychologist review, which was peer-reviewed by a mainstream journal and argues the evidence would be accepted in any other domain.

The strongest skeptical argument has two strands: (1) Reber & Alcock's (2019) Searching for the Impossibl... contention that no statistical evidence can overcome the violation of known physics, and (2) Ioannidis's (2005) Why Most Published Research... argument that small effects (d=0.1-0.3), small samples (n<100), multiple paradigms, flexible protocols, and strong beliefs create conditions where PPV < 50%.

The Schlitz–Wiseman series Experimenter Effects and th... raises a deeper problem: experimenter bias may be built into psi research itself. In 1997 and 1999, the same experiment produced opposite results depending on who ran it — a psi-believing experimenter got significant skin conductance changes while a skeptical experimenter got nothing, using identical protocols. If the experimenter's beliefs can determine the outcome, it may be impossible to preserve objectivity via the exclusion of experimenter intention from the experiment. A 2006 follow-up Of Two Minds: Sceptic-Propo... designed to resolve the question found no effect for anyone — which most observers regard as evidence that the earlier positive results were artifacts of experimenter bias rather than genuine phenomena.

The debate is unlikely to be resolved by any single experiment and may ultimately require either a physical mechanism for psi or a truly independent, large-scale, pre-registered replication effort.