This document discusses the development of psychological perspectives in language teaching from early associationism to modern psycholinguistics. It reviews how educational psychology began influencing language teaching in the 1930s-1940s, focusing on optimal ages and habits. In the 1960s, theorists like Carroll and Rivers developed two-stage models of second language acquisition and questioned psychological assumptions. The 1970s saw fresh debates and empirical research on these issues to advance the field, though answers remained unclear. Overall, the document examines how psychology has shaped and continues to inform theories of language learning over time.