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托福听力练习-科学美国人60秒:探测声音

2017-03-30 08:41:00来源：科学美国人60秒

点击查看>>科学美国人60秒音频：探测声音

　　科学美国人60秒听力练习：探测声音

　　科学美国人60秒英文文本

　　We know we can't hear everything in a busy area, or even in a quieter space. It's ultimately our attention that guides what sounds reach our conscious awareness. Think of the kids who can't hear the nagging parent.

　　But a new study finds another factor that determines if we can hear a sound: Whether that sound is appearing or vanishing.

　　Scientists asked participants to detect the onset or disappearance of different pure-tone sounds within soundscapes of ranging complexity. They found that listeners are really great at detecting new sounds but far less able to detect when a sound disappears. In fact they missed at least half of the changes when it involved a disappearing sound. This distinction remained within a range of soundscapes, from very simple to pretty complex.

　　Researchers call this phenomenon "disappearance blindness." Interestingly, vision studies have found a similar advantage for objects that appear, as opposed to disappearing objects.

　　This study finds that ultimately the auditory system is not a “change” detector but rather a novelty detector. The researchers note that maybe detecting the appearance of new sounds, like a predator approaching or stranger in the night, is more important for survival than detecting when that sound has gone away.

　　中文翻译请点击下一页

本文关键字: 托福听力 科学美国人

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