When the experimenter's subtle or unintentional behaviours influence the behaviour of participants in his/her experiment, the placebo effect occurs.

Question

Quizplus · Accepted Answer

This description refers to the experimenter effect or experimenter bias, not the placebo effect. The placebo effect occurs when participants in an experiment show a change in behavior or health after receiving a treatment that has no therapeutic effect, simply because they believe it does.

When the Experimenter's Subtle or Unintentional Behaviours Influence the Behaviour