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As a verb, to do; to produce; to make; to bring to pass; to execute; enforce; accomplish. As a noun, that which is produced by an agent or cause; result; outcome; consequence. The result that an instrument between parties will produce in their relative rights, or which a statute will produce upon the existing law, as discovered from the language used, the forms employed, or other materials for construing it. The operation of a law, of an agreement, or an act. The phrases take effect, be in force, and go into operation, are used interchangeably.

In the plural, a person's effects are the real and Personal Property of someone who has died or who makes a will.

West's Encyclopedia of American Law, edition 2. Copyright 2008 The Gale Group, Inc. All rights reserved.

EFFECT. The operation of a law, of an agreement, or an act, is called its effect.
     2. By the laws of the United States, a patent cannot be granted for an effect only, but it may be for a new mode or application of machinery to produce effects. 1 Gallis. 478; see 4 Mason, 1; Pet. C. C. R. 394; 2 N. H. R. 61.

A Law Dictionary, Adapted to the Constitution and Laws of the United States. By John Bouvier. Published 1856.
References in periodicals archive ?
Although experimenter effects were observed for task performance, there was no evidence that the behavior or attire of the experimenter influenced cardiovascular or self-reported distress responses during task completion.
Confronting the experimenter effect. Parapsychology Review, 20(4), 1-4.
One possibility that the authors do not discuss is goal-oriented psi experimenter effects. As discussed in the longer review (Kennedy, 2016), the pattern of results with this model is the same as for methodological bias.
In a previous paper (Parker & Millar, 2014) the crisis in psi research was related to the failure to deal with the psi-based experimenter effect. The myth here was that by studying psi like any other ability, as a normally distributed variable, progress would be made.
In a further study of experimenter effects, Watt and Nagtegaal (2004) found that, among all the sciences examined, parapsychology had taken the strongest precautions against experimenter effects by conducting 79.1% of its research using a double-blind methodology (compared to 0.5% in the physical sciences, 2.4% in the biological sciences, 36.8% in the medical sciences, and 14.5% in the psychological sciences).
The fourth methodical aspect refers to the experimenter effect, that is, an experimenter influences a participant's behavior and score according to his or her expectancies through his or her own behavior (Rosenthal & Rubin, 1978).
Although more rigorous attention to experimenter effects may have resulted in better designed studies in this area, there has been little success in adequately controlling for, or explaining, the role of individual differences in psi ability in animals.
The answer was positive, but no firm conclusions about the cause of the effect could be drawn, as it was not clear whether the induction per se or the difference in hypnotic abilities or even an experimenter effect might have caused the differences in performance.
Experimenter as subject: What can we learn from the experimenter effect? Mindfield, 8(3), 89-97.