06/04/2012

XXIII.

"The second sort of learning is known as classical conditioning. And what this is in a very general sense is the learning of an association between one stimulus and another stimulus, where stimulus is a technical term meaning events in the environment like a certain smell or sound or sight.
It was thought up by Pavlov. This is Pavlov's famous dog and it's an example of scientific serendipity.
...He developed the theory of classical conditioning by making a distinction between two sorts of conditioning, two sorts of stimulus response relationships. One is unconditioned. An unconditioned is when an unconditioned stimulus gives rise to an unconditioned response.
...So, if somebody pokes you with a stick and you say, "Ouch," because it hurts, the poking and the "ouch" is an unconditioned stimulus causing an unconditioned response. You didn't have to learn that. 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. But what happens through learning is that another association develops – that between the conditioned stimulus and the conditioned response.
...When the conditioned stimulus and the unconditioned stimulus are brought together over and over and over again, pretty soon the conditioned stimulus gives rise to the response. And now it's known as the conditioned stimulus giving rise to the conditioned response.
...So a behaviorist story about fetishes, for instance, is it's straightforward classical conditioning. Just as your lover's caress brings you to orgasm, your eyes happen to fall upon a shoe. Through the simple tools of classical conditioning then, the shoe becomes a conditioned stimulus giving rise to the conditioned response of sexual pleasure.
...So the strong classical conditioning stories about fetishes and fears sound silly and extreme and they probably are but at the same time classical conditioning can be used at least to shape the focus of our desires and of our interests.
...Has anybody here seen the movie "Clockwork Orange"? A lot of you. It's kind of a shocking movie and unpleasant and very violent but at its core one of the main themes is right out of Intro Psych. It's classical conditioning. And a main character, who is a violent murderer and rapist, is brought in by some psychologists for some therapy. And the therapy he gets is classical conditioning. In particular, what happens is he is given a drug that makes him violently ill, extremely nauseous. And then his eyes are propped open and he's shown scenes of violence. As a result of this sort of conditioning, he then – when he experiences real world violence – he responds with nausea and shock; basically, training him to get away from these acts of violence. In this example —
What's the unconditioned stimulus?
...The drug.
What's the unconditioned response?
Nausea.
What's the conditioned stimulus?
Violence.
What's the conditioned response?
"

© Paul Bloom
Yale Lectures on Introduction to Psychology, 2007

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