unconditioned stimulus

基本解释

What's the unconditioned stimulus?
什麽是無條件刺激？
The conditioned response is a preparation for the unconditioned stimulus.
條件反應是對無條件刺激的一種準備。
A reinforced trial is when the conditioned stimulus and the unconditioned stimulus go together.
強化嘗試是指條件刺激,與無條件刺激同時出現的時候。

So, the idea here is, repeated pairings of the unconditioned stimulus and the conditioned stimulus will give rise to the response.
這裡的意思是說，無條件刺激與條件刺激的反複匹配,會引起條件反應。
耶魯公開課 - 心理學導論課程節選
Now the pain of a bite, being bit, and then the pain and fear of that is an unconditioned stimulus, unconditioned response.
咬傷所帶來的疼痛感，和有此所帶來的痛苦與恐懼,就是無條件刺激和無條件反應。
耶魯公開課 - 心理學導論課程節選
When Pavlov put food powder in the dog's mouth and saliva was generated, that's an unconditioned stimulus giving rise to an unconditioned response.
巴甫洛夫給狗喂食,狗會分泌唾液，這就是無條件刺激引起了無條件反應。
耶魯公開課 - 心理學導論課程節選

any stimulus evoking an unlearnt response, esp in the context of classical conditioning, in which the conditioned stimulus is followed by the unconditioned one