An infant learns that pulling her mother's hair causes her mother to make an amusing vocal sound. the mother's "ouch" can be considered a(n) for hair pulling.

The correct answer is the reinforcement for hair pulling. Reinforcement, in behavioral psychology, is defined as a process or consequence that reinforces or strengthens one’s behavior by which is being preceded by a stimulus that is considered to be a specific antecedent.

answer; no longer than a reasonable period of time;