The effects of social priming, the voodoo theory of social psychology, manifested themselves only when the experiments weren't double blinded, exposing a self-fulfilling prophecy

The Role of Experimenter Belief in Social Priming. Thandiwe S. E. Gilder, Erin A. Heerey. Psychological Science, https://doi.org/10.1177/0956797617737128

Abstract: Research suggests that stimuli that prime social concepts can fundamentally alter people’s behavior. However, most researchers who conduct priming studies fail to explicitly report double-blind procedures. Because experimenter expectations may influence participant behavior, we asked whether a short pre-experiment interaction between participants and experimenters would contribute to priming effects when experimenters were not blind to participant condition. An initial double-blind experiment failed to demonstrate the expected effects of a social prime on executive cognition. To determine whether double-blind procedures caused this result, we independently manipulated participants’ exposure to a prime and experimenters’ belief about which prime participants received. Across four experiments, we found that experimenter belief, rather than prime condition, altered participant behavior. Experimenter belief also altered participants’ perceptions of their experimenter, suggesting that differences in experimenter behavior across conditions caused the effect. Findings reinforce double-blind designs as experimental best practice and suggest that people’s prior beliefs have important consequences for shaping behavior with an interaction partner.

Keywords: social power, priming, experimenter effects, open data, preregistered

h/t: Rolf Degen https://twitter.com/DegenRolf/status/958243341338054657