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Lecture 5

Principles of Learning Lecture 5.doc

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PSYC 2330

Principles of Learning – Lecture 5 Classical Conditioning Pavlovian/Classical conditioning (S-S*) learning - Signal (S)   Significant event (S*) - Food = unconditioned stimulus (US) Naturally elicits a response (untrained) - Salivation = unconditioned response (UR) - Bell = conditioned stimulus (CS) - Salivation = becomes conditioned response (CR) - CS – US = Conditioned Excitation; the CS is an excitor (CS+) CLASS EXAMPLE - Dog is shown treats (Unconditioned Stimulus) – sits, jumps, attentive (all Unconditioned Responses) - Bird noise (Conditioned Stimulus) followed by treat; bird noise will become the CS+ and will elicit a Conditioned Response (salivation, sits, attentive, etc.) CS-no US = Conditioned Inhibition; the CS is an inhibitor (CS-) - 1. Differential inhibition procedure CS1 (tone)  US (food) CS2 (light)  no US (no food) CS2 (light) becomes inhibitory. - 2. Conditioned inhibition procedure Step 1: CS1 (tone)  US Step 2: CS1 (tone) + CS2 (light)  no US CS2 (light) becomes inhibitory. Can be tested by 2 test procedures: 1. Summation Test: CS (buzzer) + CS2 (light) = no CS to CS (buzzer)  The buzzer normally elicits the conditioned response, but if CS2 has become inhibitory, the animal will no longer display the response when the buzzer is paired with the light. 2. Retardationof-acquisition Test: CS2 (light) difficult to condition to an unconditioned stimulus (it will take much longer because the animal will have to unassociate the stimulus with inhibititory feelings & reassociate it with positive feelings. Is it Really S-S* Learning? -Pseudo-conditioning: increased responding to the CS that might occur because of mere exposure to the US (food).  Give the dog enough food that it begins salivating to anything because it expects a continuous flow of food.  Solution: tone + food in a random pattern (food, tone, food, tone, tone tone tone, food food food, wait, food, tone, etc.) - Sensitization to the CS: being exposed to the tone enough causes the response. - S-R learning:  Classical conditioning assumes that the CS (bell) creates a connectiong with the US (food) & then creates a path of CS  US  Response.  S
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