After аn eаrthquаke warning came acrоss the televisiоn, yоung Lliam became terrified of the alarm sound that signaled a severe weather warning. Over the next few months he heard it several times when the “required monthly tests” came on the television, and his fear faded away. One day the alarm sounded and Liam jumped up and ran out of the room. This return of a previously extinguished response is called ________.