During which decade did the expansion and acceptance of psychology as a professional discipline occur?

The decade of 1910-1929 is significant for the expansion and acceptance of psychology as a professional discipline due to several key developments. During this time, the field began to establish its identity through the formation of professional organizations such as the American Psychological Association in 1892, which garnered more attention and credibility. The application of psychological principles in various areas, including education, healthcare, and industry, became more widespread, marking a transition from psychology being primarily a theoretical pursuit to a practical one.

This period also saw advancements in psychological testing and the implementation of intelligence tests, which played crucial roles in educational psychology and the assessment of individuals. The combination of these factors contributed to an increased recognition of psychology as a valid and necessary professional field. The growing body of research, establishment of graduate programs, and increased visibility in public life further solidified the discipline’s place in both academia and practice.

In contrast, the other decades mentioned do not encapsulate the peak of this professional expansion as effectively. The years before 1910 were characterized more by the foundational establishment of psychology than its widespread professional acceptance. The decades following 1929 also experienced developments influenced by the Great Depression and World War II, which shifted focus to applied psychology, but the foundational expansion primarily occurred