Psychology Psychology, the science of behavior and mental processes, has its roots in many disciplines and countries. Psychology's important issues include the relative contributions of biology and experience. Although the different perspectives on human nature have their own purposes and questions, they are complementary and together provide a fuller understanding of mind and behavior. Some psychologists conduct basic or applied research; others provide professional services, including assessing and treating troubled people. With its perspectives ranging from the biological to the social, and settings from the clinic to the laboratory, psychology has become a meeting place for many disciplines. The scientific attitude reflects an eagerness to skeptically scrutinize competing ideas with an open-minded humility before nature. This attitude, coupled with scientific principles for sifting reality from illusion, prepares us to think critically. Two reliable phenomena-hindsight bias and judgmental overconfidence-illustrate the limits of everyday intuition and our need for scientific
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