Quiz 7: Conducting a Good Experiment Ii: Final Considerations, Unanticipated Influences, and Cross-Cultural Issues

Psychology

(1) Some innocent people are shown to be liars. (2) The effectiveness relies on people believing the polygraph is effective, not on it actually being effective. (3) Some individuals are capable of defeating the test.

The polygraph measures heart rate, sweating, etc. The tester asks control questions to get a baseline level of arousal. Then the tester asks questions about which the participant might lie. If the participant lies, heart rate and sweating will increase.

expectancy about the effectiveness of the polygraph: half of the participants were told that the polygraph is always accurate, and half were told that lie detectors can be deceived

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