Some had vertical stripes.
图案形式有横纹,
Some had zigzags.
竖纹,
And some had checks.
锯齿纹和方格纹。
Others, acting as controls, had no internal patterns.
而作为参照的物体则未喷涂任何图案。
Each test involved a jazzy rectangle crossing the screen either before or after a plain one.
每次实验志愿者在观看了迷彩图案的长方形横过电脑屏幕之前或之后,还被要求观看一个没有条纹图案的物体横过屏幕,
Volunteers had to estimate which of the two was travelling faster.
之后志愿者需要估计这两个物体哪个移动速度较快。
In fact, in all cases, the two rectangles travelled at the same speed.
实际上,在所有实验中,这两个长方形物体移动的速度都相同。
But the researchers varied the conditions in other ways, without telling the participants.
但研究人员通过其它方式改变了实验条件,志愿者对此却一无所知。
Sometimes both rectangles travelled slowly, at just over 3o of arc a second from theobserver s point of view, as a ship might.
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