D. J. Bem and C. Honorton (1994) recently presented in this journal a set of ganzfeld extrasensory perception (ESP) experiments conducted by C. Honorton that appeared to support the existence of a communication anomaly. In this article, the authors present a meta-analysis of 30 ganzfeld ESP studies from 7 independent laboratories adhering to the same stringent methodological guidelines that C. ...

An experiment reported by Charles T. Tart as providing evidence that subjects can learn to use ESP is examined for the possibility that the highly significant scoring rates could be due to factors other than ESP by the subjects. Since the procedure involved a screening of experimenters as well as subjects and the highly significant results were obtained by only one experimenter, it is likely th...

The authors recently published a nonsignificant meta-analysis of 30 extrasensory perception ganzfeld studies, all conducted after the 1986 publication of important methodological guidelines aimed at reducing sources of artifact noted in earlier studies. In response, L. Storm and S. Ertel (2001) presented a meta-analysis of 79 studies published between 1974 and 1996. They argued that the positiv...