Final answer:
Premack's principle, also known as "Grandma's rule," is named so because it's akin to the common strategy grandparents use to encourage a less desired behavior by offering a more desired one as a reward afterward, reflecting natural wisdom in behavioral motivation.
Step-by-step explanation:
Premack's principle is often referred to as "Grandma's rule" because it reflects a common behavioral strategy used by grandparents, which involves requiring a less desirable behavior to be completed before allowing a more desirable behavior. Specifically, this principle was introduced by psychologist David Premack, who theorized that more probable behaviors will reinforce less probable behaviors when used as a reward. For example, a grandmother might say to her grandchild, "You can have dessert (a high-probability behavior) after you finish your vegetables (a low-probability behavior)." This strategy on leveraging a preferred activity to motivate a less preferred one, thus the association with the wisdom of grandparents.