According to the conduction velocity of afferent fibers and stimulus threshold, evoked EPSCs that are mediated by A-like or C-like fibers were distinguished.
以传入纤维的传导速度与刺激阈值为指标，可以区分A样纤维与C样纤维兴奋性突触后电流。
Nothing happens until the excitatory stimulus exceeds a certain " threshold " value.
兴奋性刺激超过某一临界值以前毫无反应。
The cool pain and heat pain threshold may degrade or not differentiate when the increase of the rate of stimulus is not enough.
在刺激温度变化率增加不够大时，冷痛觉、热痛觉阈值可能随温度变化率增加而降低或无差别。
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