Source Magnification: The Role of Multiple Sources in the Processing of Advertising Appeals
研究发现，当受试者接触多个信息来源而非单一来源时，对强论点与弱论点的想法和态度极化程度更大。
Using the information processing approach adopted by Harkins and Petty, the authors find the polarization of thoughts and attitudes in response to strong versus weak arguments to be greater when subjects are exposed to multiple message sources rather than to a single source.