首先，咱们必须知道感觉强度(sensation-intensity)的改变和非常 刺激强度 ( intensity of Stimulus )的改变的衡定瓜葛；其次，必须确定刚好能觉察的感觉的量值(magnitude)。
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You can be alert, even though the intensity of the stimulus is quite low.
即使刺激的强度很低，你也要保持警惕。
Aim To obtain the relationship between skeletal muscle tension and intensity of electric stimulus.
目的为得到电刺激强度与骨胳肌肌力之间的关系。
For those who are interested in mathematics: our perception functions extensively logarithmic: high sensitivity at a low level of the stimulus; how larger the intensity how lower the sensitivity.
对于那些谁是数学感兴趣的是：我们的感知功能广泛的对数：高灵敏度的刺激在较低水平，如何更大的力度如何降低灵敏度。
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