ScienceDaily -- A picture inflates the perceived truth of true and false claims.
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In a series of four experiments in both New Zealand and Canada, Newman and colleagues showed people a series of claims such as, "The liquid metal inside a thermometer is magnesium" and asked them to agree or disagree that each claim was true. In some cases, the claim appeared with a decorative photograph that didn't reveal if the claim was actually true -- such as a thermometer. Other claims appeared alone. When a decorative photograph appeared with the claim, people were more likely to agree that the claim was true, regardless of whether it was actually true.
MORE: http://www.sciencedaily.com/releases/2012/08/120808081334.htm