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A psychologist is a practitioner of psychology, the systematic investigation of the human mind, including behavior and cognition. In many countries, the title of psychologist is regulated by statute and licensing with the appropriate professional body is required. The American Psychological Association has issued a guideline that only those who hold a PhD or PsyD degree in psychology or a closely related field should call themselves psychologists. Although the APA is influential in the realm of psychology worldwide, this guideline can be regarded, for those outside the US, as a suggestion, and in any case, significant contribution to psychology is the primary consideration here.

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This category has the following 9 subcategories, out of 9 total.