他们向耶鲁大学心理学家卡尔·霍夫兰及其同事寻求帮助，前者的研究结果成就了由沟通者、受众和信息等三组变量组成的著名的说服模型。
They sought help from Yale University psychologist Carl Hovland and his associates, who produced what has become a well-known model of persuasion, comprising three groups of variables related to the communicator, the audience, and the message.