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Related to experimenter: experimenter bias, experimenter effect
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Several parapsychological researchers have noted the need for multiple-experimenter procedures that make intentional or unintentional data alterations by one experimenter difficult (see Kennedy, 2013b).
The experimenter placed each item on the table in front of the participant and asked, "Where is the [item]?
While the variables impinging on the subject during baseline are at least similar to those during intervention, the experimenter must demonstrate they are the same.
In the present experiment, one group was presented with a choice between identical schedules, 25 s of video followed by 5 s of waiting without reinforcement, and after 20 trials the experimenter expressed a preference for choosing the side that received fewer choices (usually the side opposite the hand preference) to ascertain the degree of compliance when it entailed no loss of reinforcement.
In a third experiment, 12 volunteers experiencing a body-swap with a female experimenter exhibited comparable physiological signs of emotional arousal when a knife was passed just over the experimenter's arm.
The instructor and the learner, respectively, sat to the right and left of the experimenter around the table so that the learner was opposite the instructor.
The mentation review has a crucial role in the procedure because it provides the opportunity for subjects to expand upon their earlier reports, or to correct any experimenter misunderstanding.
The good news, Mogil said, is that the problem is easily solved by simple changes to experimental procedures, for example, since the effect of males' presence diminishes over time, the male experimenter can stay in the room with the animals before starting testing.
During the games, the experimenter left children alone in the room for 90 seconds, pretending to attend a phone call.
The importance of considering experimenter effects on outcomes in experimental studies dates back to the work of Rosenthal (1966), who documented the influence of a variety of experimenter characteristics (e.