If an owner rewards the fifth bark directed at a visitor but ignores the first four, which behavior pattern is being inadvertently reinforced?

Answer

Five barks.

The specific vocalization that results in the desired attention or entry is what the dog learns to repeat; in this case, the pattern reinforced is the sequence of five barks leading to the reward.

If an owner rewards the fifth bark directed at a visitor but ignores the first four, which behavior pattern is being inadvertently reinforced?
DogbarkAustralian Terrier