Dealing with the Experimenter Effect

Methods in experimental science assume objective facts, and those effects are generally independent of the observer or experimenter. This objectivity assumption is not warranted in the field of human studies. Results of psychological experiments tend to be dependent on among other things the expectations of the experimenter. The experimenter effect togther with the replication crisis in social psychology are major issues in experimental parapsychology. We use Houtkooper's Hierarchical Observational Theory to look at a model for dealing with this issue, and conclude that multiple-experimenter projects might be able to sort out experimenter effects from intrinisic effects. Keywords: experimenter effect; replication crisis; psi; parapsychology

Benveniste’s Experiments Explained by a Non-Conventional Experimenter Effect

Background: Benveniste’s biology experiments suggested the existence of molecular-like effects without molecules (“memory of water”). In this article, it is proposed that these disputed experiments could have been the consequence of a previously unnoticed and non-conventional experimenter effect. Methods: A probabilistic modelling is built in order to describe an elementary laboratory experiment. A biological system is modelled with two possible states (“resting” and “activated”) and exposed to two experimental conditions labelled “control” and “test”, but both biologically inactive. The modelling takes into account not only the biological system, but also the experimenters. In addition, an outsider standpoint is adopted to describe the experimental situation. Results: A classical approach suggests that, after experiment completion, the “control” and “test” labels of biologically-inactive conditions should be both associated with “resting” state (i.e. no significant relationship between labels and system states). However, if the fluctuations of the biological system are also considered, a quantum-like relationship emerges and connects labels and system states (analogous to a biological “effect” without molecules). Conclusions: No hypotheses about water properties or other exotic explanations are needed to describe Benveniste’s experiments, including their unusual features. This modelling could be extended to other experimental situations in biology, medicine and psychology.

Studying Guilt Perception in Millennials

The present study explored mock jurors’ guilt judgments with a 2 (Jurors’ Race: Black vs. White) × 2 (Suspects’ Race: Black vs. White) × 2 (Suspects’ Attractiveness: High vs. Low) design in a group of Millennials ( N = 331). Black jurors were more lenient; all jurors were more lenient toward Black suspects; and White jurors were less lenient toward Black unattractive suspects. The current study contributes the following novel findings to the literature: documentation of a possible Black experimenter effect in mock jurors; an interaction among suspects’ race, suspects’ attractiveness, and jurors’ race, suggesting that racial bias exhibited by White jurors may be masking itself as an unattractiveness bias; and additive empathy by Black jurors toward persons who fall within more than one underprivileged group.