And now scientists have learned that the area of the brain that processes the echoes is not the region for hearing-it's actually the visual cortex.

而科学家研究发现，在这些人的大脑中，处理回声的部分并不是掌管听力的部分，而是大脑的视觉皮质。

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It happens because visual and hearing senses are trying to share limited brain capacity, they said.

之所以会这样，是因为大脑中的视觉细胞和听觉细胞会争夺有限的大脑空间。

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In town, enrollment rate of compulsory education for visual, hearing, and intellectual disabled children of the right age is more than 95%.

城镇适龄视力、听力、智力残疾人儿童少年义务教育入学率均达95%以上。

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Stress has also been linked in previous research with premature births and birth defects including visual, hearing and intellectual impairments, as well as complications in the respiratory, gastrointestinal and renal systems.

BBC: Earthquakes 'trigger early births'

Scientists have said that designing a bionic eye has been much more difficult than developing aids like cochlear implants for hearing, in part because visual information is two-dimensional, and because of the anatomy of the eye.

WSJ: FDA Approves Bionic Eye