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In page Psychosis:

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The subject matter of delusions seems to reflect the current culture in a particular time and location. For example, in the US, during the early 1900s syphilis was a common topic, during the Second World War Germany, during the Cold War communists, and in recent years, technology has been a focus.[4] Some psychologists, such as those who practice the Open Dialogue method, believe that the content of psychosis represents an underlying thought process that may, in part, be responsible for psychosis,[5] though the accepted medical position is that psychosis is due to a brain disorder.[citation needed]