Afterglow 夕照,晚霞
Heres an experiment you can try: look at something bright relative to its surroundings, such as a lamp or a sunny window, for ten seconds without blinking. Then shut your eyes and cover them over with your hands.
你可以尝试这样的试验:不眨眼盯着看相对周围而言光亮的东西十秒钟,比如,一盏灯或洒满阳光的窗户;接着闭上眼睛且双手蒙住。
You will find that the lamp or window still seem to be hovering in front of you, quite visible at first and only gradually fading away. Yet your eyes are closed and your hands are blocking them completely so where is the light coming from?
你会发现那盏灯或窗户依旧浮现在眼前,最开始清晰得很,又慢慢消失。可是,你不是闭眼了吗?况且双手不是严实地蒙住了吗?那么,光线从何而来?
The answer is that the afterglow light you see isnt really light at all. Its the result of residual activity of the nerve cells on the back of your eye, called the retina. In sensory psychology this effect is called a positive afterimage.
答案是残留的余光根本不是真正的光芒。其实这是视网膜的痕迹作用。感官心理学将这种现象称作正后像。
You can think of it as something like the vibration of a string after it has been struck. The players finger is taken away, and yet the sound continues, because the energy she or he put into the string takes a little while to dissipate.
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