Which of the following was an important part of the foundation of abnormal psychology?

Question

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In-depth studies of deviant people were an important part of the foundation of abnormal psychology, as they helped to identify and categorize different types of abnormal behavior and mental illness. These early studies paved the way for the development of diagnostic criteria and effective treatments for various disorders. The other options, such as mapping the human genome, drug therapy outcome studies, and physiological research on brain dysfunction, are more recent developments that have contributed to our understanding of abnormal psychology, but were not as foundational.

Which of the Following Was an Important Part of the Foundation