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  3. Folk wisdom holds that the blind can hear better than people with sight. Scientists have a new reason to believe it. Researc

Folk wisdom holds that the blind can hear better than people with sight. Scientists have a new reason to believe it. Researc

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问题     Folk wisdom holds that the blind can hear better than people with sight. Scientists have a new reason to believe it.
    Research now indicates that blind and sighted people display the same skill at locating a sound’ s origin when using both ears, but some blind people can home in on sounds more accurately than their sighted counterparts when all have one ear blocked. Canadian scientists described the work in the Sept. 17 NATURE.
    Participants in the study were tested individually in a sound-insulated room. They faced 16 small, concealed loudspeakers arrayed in a semicircle a few feet away. With a headrest keeping their heads steady, the participants pointed to the perceived origins of the sounds.
    The researchers tested eight blind people, who had been completely sightless from birth or since a very early age. They also tested three nearly blind persons, who had some residual vision at the periphery of their gaze; seven sighted people wearing blindfolds; and 29 sighted people without blindfolds. All participants were tested beforehand to ensure that their hearing was normal.
    When restricted to one-ear, or monaural, listening, four of the eight blind people identified sound sources more accurately than did the sighted people, says study co-author Michel Pare, a neuroscientist at the University of Montreal. The sighted people showed especially poor localization of sounds from the speakers on the side of blocked ear.
    In sighted people who can hear with both ears, " the brain learns to rely on binaural [ stereo ] cues. These data suggest that blind people haven’ t learned that and keep monaural cues as the dominant cues," says Enc I. Knudsen, a neurobiologist at Stanford University School of Medicine, "I find it surprising. "
Under what conditions, according to Pare, did the blind testees perform better than their sighted counterparts?
选项 A、When both used one ear
B、When the speakers were concealed
C、When the sounds were turned down
D、When both were restricted to blindfolds
答案A
解析 第二段讲到用两耳时blind和sighted people以同样的水平locating a sound’s origin，而用一只耳朵时有些blind people能够比有视力的人更准确地找出声源。
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