backward conditioning -US occurs before CS. example - the food is presented, then the bell rings. This is not really effective. b) Extinction - this is a gradual weakening and eventual disappearance of the CR tendency. Extinction occurs from multiple presentations of CS without the US. Essentially, the organism continues to be presented with the conditioned stimulus but without the unconditioned stimulus the CS loses its power to evoke the CR. For example, Pavlov's dogs stopped salivating when the dispenser sound kept occurring without the meat powder following. c) Spontaneous Recovery - sometimes there will be a reappearance of a response that had been extinguished. The recovery can occur after a period of non-exposure to the CS. It is called spontaneous because the response seems to reappear out of nowhere. d) Stimulus Generalization - a response to a specific stimulus becomes associated to other stimuli (similar stimuli) and now occurs to those other similar stimuli. For Example - a child who gets bitten by black lab, later becomes afraid of all dogs. The original fear evoked by the
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This note was uploaded on 11/14/2011 for the course PSY PSY2012 taught by Professor Scheff during the Fall '09 term at Broward College.