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So while crosswords certainly won't make you a better pitcher, there is some reason to believe they could have a positive mental effect.
WSJ: Mets Find Answer
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While the exact mental state that allows the placebo effect to kick in remains a mystery, the belief that something will work seems to be a necessary ingredient.
ECONOMIST: Pain perception
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She contends that there is epidemiological evidence to the effect that people with mental health issues actually fare as well in communities where there is less medicalization of their condition.
CNN: Seeking comfort from faith healers in India