Theunusualabilityofblindpeopleto"sense"unseenobjectshas...

问题详情：

The unusual ability of blind people to "sense" unseen objects has been demonstrated for the first time in sighted volunteers whose vision was blanked out by scientists.

The findings suggest "blindsight",which has been observed in blind people whose eyes function normally but who have suffered damage to the brain's Visual centre,is a real and not imagined phenomenon.

In the tests,the blind have been able to distinguish basic shapes of objects they cannot see,as well as their orientation（定向）and direction of other occasions a blind person has reported experiencing a "feeling" that an object is present,while not being able to see it.

A number of theories have been proposed to explain "blindsight"rally,it is suggested that other parts of the brain besides the primary visual cortex respond to nerve messages from the eyes at an unconscious level.

Scientists from the University of Houston in Texas temporarily blinded a group of 12 volunteers by using an electromagnetic field to shut down the primary visual es were then flashed in front of them on a screen.

In one experiment,volunteers were shown either a horizontal（水平的）or vertical another,a red or green dot appeared.

Most of the time,the volunteers were unaware of the images with which they were they guessed either the orientation of the bar or the colour of the dot correctly more often than would have been expected by the law of averages.

The researchers said the findings suggested that a visual pathway bypassing the primary visual cortex must be responsible for "blindsight".

do we know about the primary visual cortex in the brain?

can be replaced by other parts of the brain.                

works by sending messages to the eyes.

is the only part to react to messages from the eyes.    

is not the only part to react to messages from the eyes.

was the primary visual cortex shut down in the experiment?

that the volunteers couldn't see.          that images could flash on a screen.

order to test the volunteers' eyes.         order to get messages from the eyes.

h of the following can replace the underlined word "bypassing" in the last paragraph?

ing to.               g around.            ting in.         ng from.

this text,the author explains     .

"blindsight" is needed                       "blindsight" possibly occurs the primary visual cortex works              the primary visual cortex is important

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