These birds must have a good optomotor response considering they are stationary 90 per cent of the time.
鉴于蜂鸟在90%的时间里都处于静止状态，它们肯定具有一种优秀的视觉运动（optomotor）反应能力。
The reaction of optomotor intensifies with the increasing width and number of vertical stripes within certain range.
就垂直条纹而言，在一定范围内，反应随条纹宽度和数量的增加而增强。
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