1.利用“睡眠者效应”。心理学家通过严格的实验发现,从即时影响的角度看,同样的信息,由高威信的传达者(如专家、教授)提供,的确比由低威信传达者提供引起更多的思想态度的变化,但是,三个星期后的再次检查表明,各种来源的信息所造成的态度改变效应巳经趋于一致。也就是说,原有信息来源的威信所起的作用已趋于消失。而一般信息源所引发的态度变化,却反而随时间推移 Use the Sleeper Effect. Through rigorous experimentation, psychologists have found that the same information, delivered by Galveston communicators (such as experts and professors) from an instantaneous perspective, is indeed much more evocative than those offered by low prestige communicators However, a re-examination three weeks later showed that the effect of the change of attitudes caused by the various sources of information had tended to coincide. In other words, the prestige of the original source of information has tended to disappear. The change of attitude caused by the general information source, on the contrary, over time