来自《耶鲁大学开放课程：心理学导论 第4集 第4集》

• 
  
  repeated pairings of the unconditioned stimulus and the conditioned stimulus
  无条件刺激与条件刺激的反复匹配
• 
  
  will give rise to the response.
  会引起条件反应
• 
  
  And there's a difference between reinforced trials and unreinforced trials.
  但强化尝试和非强化尝试是不一样的
• 
  
  A reinforced trial is when the conditioned stimulus
  强化尝试是指条件刺激
• 
  
  and the unconditioned stimulus go together.
  与无条件刺激同时出现的时候
• 
  
  You're--and to put it in a crude way,
  简单地说
• 
  
  you're teaching the dog
  你在让狗知道
• 
  
  that the bell goes with the food.
  铃声和食物是一起出现的
• 
  
  An unreinforced trial is when you get the food without the bell.
  非强化尝试是只有食物而没有铃声的时候
• 
  
  You're not teaching the dog this.
  这就不需要你去教了
• 
  
  And, in fact, once you teach an animal something,
  事实上 条件反射形成以后
• 
  
  if you stop doing the teaching
  如果得不到强化