How did John Locke explain the association of ideas?

In his work An Essay Concerning Human Understanding, John Locke explains that the association of ideas occurs when ideas become linked in the mind such that one idea triggers the formation of another, even if they lack a logical connection.12

These associations are formed because the ideas were experienced together repeatedly in the past. Locke emphasized that this psychological tendency has significant implications for the education of children; by intentionally pairing rewards with good behavior and punishments with bad behavior, educators can help children develop positive habits.12

By analyzing how individuals link these ideas, Locke provided insights into human thought processes and significantly influenced the development of associationist psychology, notably impacting the work of David Hartley. This concept remains a foundational topic within the field of psychology today.12