北師大版高中英語模塊11--Unit33(3)-3

[00:00.84]3 Your voice [00:03.63]Cheaper and faster than a polygraph, [00:06.18]the voice stress analyser, [00:08.31]or VSA is based on the premise [00:10.85]that our voice changes when we are under stress [00:13.90]-when we're lying for example. [00:15.91]The VSA detects the changes, [00:18.49]and will work on a telephone, [00:20.29]tape recording or from the next room via [00:23.30]a wireless mic or bug. [00:25.35]The analyser monitors the subject's [00:27.56]voice patterns and inflections, [00:29.99]and electronically evaluates their relative [00:32.81]stress patterns to determine [00:34.82]if they are lying or not. [00:36.97]Now you can even buy a "Truth Phone", [00:39.94]so when your friend rigns to say they're sick [00:42.57]and can't do their share of your group project, [00:45.52]you can immediately know [00:47.29]if it's true or not! [00:48.93]Research indicates this technology [00:51.11]is not very precise at picking up [00:53.46]deceitfulness however. [00:56.26]4 Hesitation [00:58.39]The period of time between the last word [01:00.71]of an investigator's question [01:02.59]and the first word of the subject's [01:05.13]response is know as "Response latency". [01:07.82]Research tells us that the average response [01:10.44]latency for subjects who are telling the truth [01:13.29]is 0.5 seconds... [01:15.87]whereas the average latency for liars [01:18.60]is 1.5 seconds. [01:18.60]

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