Final answer:
Harry Harlow's research concluded that monkeys developed 'learning sets,' which refers to the ability to learn how to learn, denoting the monkeys' ability to adapt and develop problem-solving strategies from experience.
Step-by-step explanation:
According to Harry Harlow's research, when monkeys realized that the food was consistently under the same box after multiple trials, they began to go back to that box. Harlow concluded that the monkeys had formed what he termed learning sets. This concept refers to the ability to learn how to learn, or the process by which organisms learn to solve problems more efficiently through practice. This type of cognitive learning involves forming strategies for dealing with new situations based on past experiences.
Learning sets are contrasted with cognitive maps, which are mental representations of physical spaces, and reinforcers, which are stimuli that increase the likelihood of a behavior when presented. Cognitive sets are general strategies that facilitate problem-solving and adaptability.