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Associative_Learning_and_More
2013-11-13 来源: 类别: 更多范文
Associative Learning and More
We use the term classical conditioning to describe one type of associative learning
in which there is no contingency between response and reinforcer. This situation resembles
most closely the experiment from Pavlov in the 1920s, where he trained his dogs to
associate a bell ring with a food-reward. In such experiments, the subject initially shows
weak or no response to a conditioned stimulus (CS, e.g. the bell), but a measurable
unconditioned response (UCR, e.g. saliva production) to an unconditioned stimulus (UCS,
e.g. food). In the course of the training, the CS is repeatedly presented together with the
UCS; eventually the subject forms an association between the US and the CS. In a
subsequent test-phase, the subject will show the conditioned response (CR, e.g. saliva
production) to the CS alone, if such an association has been established and memorized.
Such Pavlovian conditioning is opposed to instrumental or operant, where producing a CR
controls the UCS presentations. Therefore, classical conditioning involves learning by
association - where you simply learn by associating two events that often occur together.
Conditioning, in general occurs more rapidly when the conditioned stimulus in unfamiliar
rather than familiar. High order conditioning is when a CS can be used to produce a
response from another neutral stimulus (can evoke CS). There are a couple
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