Why Do People Blink Their Eyes?
People blink(眨眼)their eyes tens of thousands of times every day.Scientists have long believed blinking was an involuntary movement and served mainly to keep the eyeballs wet.But a new study suggests it has a more important purpose.
An international team of scientists from the University of California at Berkeley studied the blinking of human eyelids.The journal Current Biology published their findings.The team said they found that blinking “repositions our eyeballs so we can stay focused” on what we are seeing.They said that when we blink our eyelids,the eyes roll back into their sockets—the bony area that surrounds and protects the eyes.However,the researchers found the eyes don’t always return to the same position.They said this causes the brain to tell the eye muscles to reorganize our eyesight.
Gerrit Maus is the lead writer of the report.He serves as an assistant professor of psychology at Nanyang Technological University in Singapore.Maus said,“Our eye muscles are quite sluggish(迟缓的)and imprecise,so the brain needs to constantly adapt its motor signals to make sure our eyes are pointing where they’re supposed to.Our findings suggested that the brain measures the difference in what we see before and after a blink,and commands the eye muscles to make the needed corrections.” The researchers said that without such corrections our surroundings would appear unclear and even jumpy.They said the movement acts “like a steadicam(摄影机稳定器)of the mind.”
The researchers said they asked volunteers to sit in a dark room while staring at a small dot on a flat surface.They used special cameras to follow the volunteers’ blinks and eye movements.After each blink,the dot was moved one centimeter to the right.The volunteers did not notice this,but the brain did.It followed the movement and directed the eye muscles to refocus on the dot.After the dot was moved in this way 30 times,the volunteers’ eyes changed their focus to the place where they predicted it would be.
Professor Maus said,“Even though participants did not consciously register that the dot had moved,their brains did,and adjusted with the corrective eye movements.These findings add to our understanding of how the brain constantly adapts to changes,commanding our eye muscles to correct for errors in our bodies’ own hardware.”
1.According to the new study,blinking eyes can .
A.serve to keep the eyeballs wet B.reposition eyeballs to stay focused
C.consciously correct eye movements D.make our eyes adapt to motor signals
2.From the experiment,we can learn that .
A.volunteers could see the moving dot with special cameras
B.the eyeballs could stay in the place as they were predicted
C.participants were aware of the dot’s movements to the right
D.the brain commanded the eye muscles to refocus on the dot
3.The underlined word “register” in Paragraph 5 probably means .
A.realize B.refocus C.reserve D.reason
4.This passage shows that .
A.eye muscles are quite inactive and imprecise
B.the research is of great value in the eye movement
C.the brain plays an important role in seeing things clearly
D.volunteers control their blinks to follow the changes of the dot
语篇解读:本文是一篇说明文。科学家们认为眼球的不断闪烁有一个更重要的用途——让我们可以保持眼神的集中。
答案及剖析:
1.B 细节理解题。根据The team said they found that blinking“ repositions our eyeballs so we can stay focused”on what we are seeing...They said this causes the brain to tell the eye muscles to reorganize our eyesight.可知,眨眼睛是在复位我们的眼球,这样我们可以专注于我们所看到的。故选B。
2.D 细节理解题。根据After each blink,the dot was moved one centimeter to the right.The volunteers did not notice this,but the brain did.It followed the movement and directed the eye muscles to refocus on the dot.可知,是我们的大脑指挥着眼部肌肉,使得眼球重新聚焦在点上。故选D
3.A 词义猜测题。本句句意为“即使参与者没有意识到点的移动,但是他们的大脑意识到了,并调整矫正眼球随之运动。”故选A。
4.C 主旨大意题。由全文内容可知,我们的大脑指挥着眼部肌肉,通过眨眼睛的动作复位我们的眼球,使得眼球重新聚焦在我们看的物体上。所以,大脑在我们看清物体方面起着重要作用。故选C。
