Experimenter Bias in Hypnotist Performance

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Science  18 Sep 1964:
Vol. 145, Issue 3638, pp. 1330-1331
DOI: 10.1126/science.145.3638.1330


Eight hypnotist-experimenters administered a standardized suggestibility test to subjects under two separate experimental conditions. The experimenters understood the problem of experimenter bias, knew that they were being checked, and felt that they had treated both groups alike, yet judges were able to tell under which condition the subjects were tested by listening to the performances of the experimenters.