In the 1920s and 1930s, the philosophical system of ________ reinforced American psychologists' belief that psychology needed to be defined as the science of behavior.

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The philosophical system of logical positivism emphasized the importance of empirical evidence for scientific claims and rejected metaphysical concepts that could not be verified through observation or experimentation. This reinforcement of empirical observation aligns with the focus on behavior in American psychology at the time.

In the 1920s and 1930s, the Philosophical System of ________