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In ufology, the psychosocial or psychocultural hypothesis, colloquially abbreviated PSH or PCH,...

In ufology, the psychosocial or psychocultural hypothesis, colloquially abbreviated PSH or PCH, argues that at least some UFO reports are best explained by psychological or social means. It is often contrasted with the better known extraterrestrial hypothesis (ETH), and is particularly popular among UFO researchers in the United Kingdom, such as David Clarke, Hilary Evans, the editors of Magonia magazine, and many of the contributors to Fortean Times magazine. It is also popular in France since the publication in 1977 of a book written by Michel Monnerie, Et si les ovnis n'existaient pas? (What if ufos do not exist?). UFOlogists claim that the psychocultural hypothesis is occasionally confused with aggressive anti-ETH debunking, but that there is an important difference in that the PCH researcher sees UFOs as an interesting subject that is worthy of serious study, even if it is approached in a skeptical (i.e. non-credulous) way. The psychocultural hypothesis is not a single, all-encompassing explanation of the UFO phenomenon, but explains different cases in different ways, all centering in some way on human behavior. Examples of PCH explanations are wishful thinking,