Nature 220, 89 - 91 (05 October 1968); doi:10.1038/220089a0

Identification of Concealed Randomized Objects through Acquired Response Habits of Stimulus and Word Association

J. G. PRATT, I. STEVENSON, W. G. ROLL, J. G. BLOM, G. L. MEINSMA, H. H. J. KEIL & N. JACOBSON

Department of Psychiatry, University of Virginia, Charlottesville, Virginia.
Psychical Research Foundation, Durham, North Carolina.
Institute of Phonetic Sciences, University of Amsterdam.
Department of Psychology, University of Tasmania.
School of Medicine (student), University of Lund, Sweden.

SINCE 1962 several investigators have reported experimental results supporting the claim that Pavel Stepanek of Prague could demonstrate an ESP ability in a simple test situation. In the test used, Stepanek attempted on each trial to say whether the green or the white side of a card hidden in an opaque cover was presented upward. Two of us¹ summarized the literature dealing with this subject and presented confirmatory evidence obtained in stringently safeguarded experimental conditions.

1. Blom, J. G. , and Pratt, J. G. , J. Amer. Soc. Psychical Res., 62, 28 (1968).