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段落1

NARRATOR

Now listen to part of a lecture on this topic in a psychology class.

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段落2

MALE PROFESSOR

Some researchers did an experiment related to this.

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What they did was,

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they assembled a group of subjects, a group of students...

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And they showed these students a series of geometrical shapes.

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These were very distinctive shapes, a little unusual,

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not the kind of shapes the students often see.

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But they only showed the students the shapes for a very short period of time-

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about a second. They also lowered the light in the room,

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to make it even more difficult for the students to see the shapes.

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So the shapes were there for a split second,

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in dim light,

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and then they were gone.

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段落3

In the next step of the experiment,

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the researchers again showed the students some shapes...

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But this time

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they gave the students a longer time to look at them.

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And this time, they showed the images in pairs -

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two at a time. In each pair,

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one shape was a shape the students had already seen-

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for just a split second, in dim light-

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and the other was some other shape that hadn't been shown to them before.

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After presenting each pair,

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the researchers asked the students to say which of the two shapes they liked better.

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Most of the time,

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the students preferred the shape they'd already seen earlier in the experiment.

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Now if you asked them if they'd already seen that shape,

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they probably wouldn't know for sure.

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But that didn't matter-

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they still tended to prefer the shapes they'd already seen.

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