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Unformatted text preview: Sympathetic Branch Emotions get out of control. So to control emotions we do a light detection test also known as a polygraph. Notion is if you ask a person a question whether or not they killed someone, their heart rate goes up etc. and the polygraph measures those re- sponses. Unfortunately, the polygraph doesnt work. You are concerned about getting caught even if you didnt do it. It is unreliable and invalid. The federal govt. still uses it even though they know it doesnt work. Refusing to take the test makes the testers think your guilty. One way the polygraph can work Guilty knowledge test. Ask suspect things about the crime that no-one else would know. Only the guilty person would know for example how the person was killed. You will get more emotional when the testers reach the answer that you know is cor- rect. If they consistently respond excitedly to certain answers, then you might have found your suspect. Dr. Holmes did an experiment with freshmen students involved a real crime. Stu- dents came into library and they were told they were given a test to measure their intellectual ability. They developed this test to see what people should give up in col- lege after their freshmen year. The exam is really hard, impossible. They are strug- gling. 90% of people cheated on the test. They gave them a polygraph test to see if they were lying. A lot of them just came out and said they lied before they were even tested. The polygraph test was effective when they didnt admit and the results actually did show who cheated and who did- nt....
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- Spring '08