Experimenter Effect: An experimental outcome that results, not from manipulation of the variable of interest itself, but from some aspect of the experimenter’s behavior, such as unconscious communication to the subjects, or possibly even a psi-mediated effect working in accord with the experimenter’s desire or motivation.
References
- Parapsychology by Michael A. Thalbourne, Republished by Puente Publications, Charlottesville, VA, USA, 2003