PSYC 327 Lecture Notes - Lecture 15: Scientific Modelling, Tape Dispenser, Reinforcement
22 Dec 2016
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What happens if after conditioning, cs occurred repeatedly without us (bell sounded but no food appeared, would their still be salivation?) Extinction: dogs salivated less and less (occurs when cs no longer singals impending food). Occurs in operant conditioning when response is no longer reinforced. With delay of sound for several hours, dogs would salivate to tone again. Spontaneous recovery: the reappearance, after a pause, of an extinguished cr. This suggested to pavlov that extinction suppressed the cr, did not eliminate it. Picture: idealized curve of acquisition, extinction and spontaneous recovery. The rising curve shows that the cr rapidly grows stronger as the ns becomes a cs as it is repeatedly paired with us (acquisition), then weakens as cs is presented alone (extinction). After a pause, cr reappears (spontaneous recovery), before it weakens as cs is presented alone (extinction). The first step of classical conditioning, when ns becomes a. Cs, and the cr becomes weakened, this is extinction.
