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Certain personality traits are associated with it being more likely that a person will experience the placebo effect. This is logical since the placebo effect depends on our beliefs and expectations, which some of us may subscribe to more readily and enthusiastically than others. Among the results in this area, optimists are more responsive to analgesic placebos, as are people who score higher for emotional resilience and friendliness (this last finding may relate to the social dynamic involved in the elicitation of the placebo effect by physicians). Curiously, the traits related to placebo response vary according to the condition being treated – in the context of stress, for instance, one study found it was the more pessimistic and less empathic participants who showed a greater placebo response. Whereas personality traits appear to play an important role in the placebo effect, the evidence to date suggests that age and gender are largely irrelevant.