PNB 3RM3 Lecture Notes - Lecture 32: Demand Characteristics, Body Language, Blind Experiment

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Cues that influence participants beliefs about the hypotheses being tested and the behaviours being expected of them in an experimental situation. Build rapport, then gently probe them about experience about experiment. Ask them if they had thoughts about experiment hypothesis. A way to figure out which participants know what you were doing and which did not. Increasing psychological realism makes it more likely to behave spontaneously rather than show demand characteristics. Will need more participants and is less powerful, but may be better to address demand. Compare performance of people who knew hypothesis and who did not figure out the hypothesis. If they are different, toss data of people who figured out the hypothesis. Manipulate awareness of hypothesis (and then more stats) When our expectations get translated into demand characteristics: Experimenter expectancy effects - experimenter unintentionally influences participants to respond in a way consistent with their hypothesis.

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