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The visual system is a typical example to show the plasticity of brain.
If a kitten is put in a visual environment of only vertical stripes for 3 〜 14 weeks after the birth,
it will get difficult for the cat to see horizontal contours.
And, most of visual fields become put in the range of ±30° in the vertical direction.
※ Then, simple type cells selectively react to segmental stimuli in some azimuth ( direction ).
