▶ Your Answer :
The reading passage contends that a brain scan lie detector is more accurate than a conventional one. On the other hand, the lecturer brings up several points that contradict this argument. First, the speaker argues that it is wrong to say that a brain scan lie detector never misidentify true statements as lies. This is because the same brain areas are activated both when people are holding information and when people are lying. In other words, when a person avoids a sensitive topic, the same brain regions which deal with telling lies can be activated. This casts doubt on the reading passage's claim that a brain scan lie detector do not misinterpret honest statements as lies. Second, according to the lecturer, it is untrue that results of a brain scan can be interpreted objectively. This is supported by the fact that every person shows different brain activities. Therefore, there are no standard rules that can be applied to everyone. As a result, a subjective analysis is needed even when analyzing the results of a brain scan, which means a great chance of making errors. This counters the reading passage's assertion that no subjective analysis is required when using a brain scan lie detector. The final point made by the lecturer is that it is more likely that people trick the test when using a brain scan lie detector. There are two reasons for this. First, people can arise complex feelings by solving difficult math problems, for instance. This increases brain activity and make it difficult to identify lies. Second, if people rehearse untrustful stories, a brain scan cannot find they are lying. This refutes the reading passage's argument that people hardly deceive a brain scan lie detectors.
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