A new study uses advanced brain-scanning technology to cast light onto a topic that 【M1】______ psychologists have puzzled over more than half a century: social conformity. The study 【M2】______ was based on a famous series of laboratory experiment from the 1950's by a social psy 【M3】______ chologist, Dr. Solomon Asch. In those early studies, the subjects were shown two cards. On the first was a vertical line. On the second were three lines, one of them the same length with that on the first card. Then the subjects were asked to say which two lines were 【M4】______ like, something that most 5-year-olds could answer correctly. But Dr. Asch added a twist. 【M5】______ Seven other people, in cahoots with the researchers, also examined the lines and gave their answers before the subjects did. And sometimes these confederates unconsciously 【M6】______ gave the wrong answer. Dr. Asch was astonished at what happened next.. After thinking 【M7】______ hard, three out of four subjects agreed with the incorrect answers given by the confederates 【M8】______ at least once. And one in four conformed 50 percent of the time. Dr. Asch, who died in 1996, always wondered about the findings. Did the people who gave in to group do so knowing that their answers was right? Or did the social pressure actually change their perceptions? The researchers found that social conformity showed up in the brain like 【M9】______ activity in regions that are entirely devoted to perception. But independence of judgment m standing up for one' s beliefs M showed up as activity in brain areas involved in emotion, the study found, suggesting that there be a cost for going against the group. 【M10】______ 【M1】