, a German psychiatrist often called the father of modern psychiatry. In the late 19th century, Kraepelin wasn't looking to create a job application test; he was trying to understand how the human brain fatigues. He developed a simple addition exercise to observe how a person's work speed and accuracy changed over time, believing these "work curves" could reveal underlying biological traits. In the 1920s, Japanese psychologist Yuzaburo Uchida
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