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  3. The human brain is hard-wired to recognize faces. But remembering faces is not the same as being able to describe them. This is

The human brain is hard-wired to recognize faces. But remembering faces is not the same as being able to describe them. This is

admin2014-09-30  23
问题     The human brain is hard-wired to recognize faces. But remembering faces is not the same as being able to describe them. This is particularly apparent when witnesses are asked by the police to create a composite picture of a suspect. Even when the result is thought to be a good likeness by the witness, that does not mean that other people will also be able to recognize the face and thus identify the suspect. The problem is that face recognition is a holistic(整体的)process: people are good at recognizing faces as a whole, but struggle to identify or describe individual facial features, such as a person’s eyes, nose or mouth.
    But police forces in Britain and other countries are using a new technology that solves this problem by changing the task from one of recall into one of recognition. Instead of asking witnesses to select facial features, their system, called EvoFIT, initially presents them with a grid(网格)of 18 randomly generated faces that match the race, gender and general shape of the suspect. From these the witness is asked to select the two that most resemble the suspect, however vaguely. The software then takes these two selections and "breeds" them, treating the facial features of their selections like genes, mixing them together and making random changes, to produce 18 new offspring which are displayed in a new grid. As this process is repeated, with the witness again choosing the closest two matches, the faces generated quickly converge(集合)on one that bears a resemblance to that of the suspect.
    Dr. Frowd and Hancock, the researchers of EvoFIT realized that if the results were to be improved further their evolutionary approach was not enough on its own. What was needed was a dash of psychology, because there are fundamental differences in the way people perceive familiar and unfamiliar faces, says Dr. Frowd. EvoFIT is now being used in practice. One of the British forces, the Derbyshire Constabulary, has now started using EvoFIT exclusively. "It’s doubled our workload," says Beverly Hunt, the force’s facial identification officer, because it is now possible to produce a useful image even when a witness has only a vague memory of a suspect’s face.
How does EvoFIT work according to the passage?
选项 A、It asks the witness to select facial features.
B、It asks the witness to recall the suspect’s face.
C、It asks the witness to recognize faces vaguely.
D、It asks the witness to assemble the facial features.
答案C
解析 细节辨认题。定位句表明，EvoFIT系统不再要求目击者选择脸部特征，而是首先将一组18张随机产生的脸部网格展示给目击者，这些脸部同嫌疑人的种族、性别和体形相匹配，然后都要求目击者从中选出两张与嫌疑人最相似的图片，不管有多么粗略。由此可知，EvoFIT要求目击者对嫌疑人进行粗略的脸部识别。
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