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In this video I introduce the unit on health psychology by defining several key terms and discussing the challenges of understanding the causes of illness. I describe etiology (or aetiology), epidemiology, the use of retrospective & prospective studies, and the dangers of coincidental correlations. I also consider how psychological factors may influence health, whether in the extreme of "voodoo death" or "psychophysiological death", or by influencing the expression of symptoms in psychosomatic illnesses.

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