Imagine that you have agreed to participate in an experiment on visual discrimination. Upon arriving for the study, you are asked to take your place at a table at which five other participants are seated. As you take your seat, the experimenter explains that this study will involve making perceptual judgments regarding the lengths of four lines. He then projects an image on the screen at the front of the room. On the left side of the screen there is a line labelled “X.” On the other side …

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