Long after being bitten by a stray dog,Alonzo found that his fear of dogs seemed to have disappeared.To his surprise,however,when he was recently confronted by a stray dog,he experienced a sudden twinge of anxiety.This sudden anxiety best illustrates:

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The sudden twinge of anxiety experienced by Alonzo when confronted by a stray dog is an example of spontaneous recovery. Spontaneous recovery occurs when the conditioned response reappears after a period of extinction. In this case, Alonzo's fear of dogs had essentially gone extinct, but when confronted with another stray dog, the fear response spontaneously reappeared.

Long After Being Bitten by a Stray Dog,Alonzo Found That