Just as some people believe a pill that is in fact a placebo has been of benefit to them, others will believe not-so-great images are actually high definition (HD), if they are told beforehand that is what they are about to see:
Questionnaires revealed that the people who had been led to expect HD reported seeing higher-quality images. “Participants were unable to discriminate properly between digital and high-definition signals,” says Lidwien van de Wijngaert at the University of Twente in Enschede, the Netherlands, who carried out the study with colleagues from Utrecht University.
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