Context Foreign graduate students in the US 2x / week lesson This lesson immediately follows a live lecture

Goals Critical thinking: encourage an engagement with the ideas the speaker is presenting Discussion skills: Encourage students to participate politely but assertively Supporting opinions: Encourage students to concisely give an opinion with evidence

Listening 3 Discussion

Listen to the following passage

Discuss Are polygraphs used in your country? In court? Do you think 70-80% accuracy is good enough? What about 90% accuracy? Even if you don’t have an instrument, what are some ways you can you tell if someone is lying? What would the social implications be for a hand-held lie detector with 95% accuracy?

2010FHSLecture2clip12 The polygraph machine, the old fashioned lie detector, which measures physical reactions related to anxiety, so it measures your heart rate, your blood pressure, the sweatiness of your palms, how often you're breathing, how quickly you're breathing. It's been around for over eighty years, there aren't actually very many good, rigorous studies of it, but our National Academy of Sciences did a big report on it seven years, six years ago. And they concluded from the handful of really good studies that in laboratory settings, the polygraph seemed to be accurate about seventy five to eighty percent of the time. Now, that's in laboratory settings. We don't know how well it works in the field, in the real world. The fMRI people will claim seventy to ninety percent effectiveness in the lab. I think there's some problems with that data, but again, like polygraph, we don't know how good it is outside the lab.

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Lessons Learned Audacity is totally easy and useful The hardest thing was deciding on a title Etc.