If you were to trace the development of psychology from the beginning, you would need to start before the earliest pages of recorded history, beyond even the early Greek philosophers, such as Aristotle and Plato. Psychology became distinct from philosophy when researchers began to use the scientific method to study behavior and mental processes. By the 1920s, the field's earliest researchers had laid the foundations of the major schools of thought and psychological perspectives that exist in psychology today. As the field grew and research findings accumulated, specialty areas within the field began to follow distinctive pathways.
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