... lines. They were shown a white card on which three black lines of varying lengths had been drawn and a second card containing one line. Their task was to choose the line of the first card that was most similar in length to the line on the second. One of the lines was exactly the same length as the standard, whereas the other two were quite different from it. When the lines were shown, the subjects in turn answered aloud in the order in which they were seated. Since the judgement was so easy, there were no disagreements. A second set of cards were shown, responses were given and a third set was produced. At this point, the experiment really started. The first four subjects gave the wrong answer. When it was time for the fifth subject to respond, he was quite disturbed. He was confused as he didn't know ...

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