目的 从用户认知角度，研究手机新闻APP的用户情感认知机制。方法 采用事件相关电位(ERPs)技术探索用户对手机新闻APP首页界面的情感加工过程，实验中要求被试者对刺激材料进行效价和唤醒度(情感体验的两个维度)评价，同时记录被试者的点击行为数据和脑电数据。结果 被试者对唤醒度进行评价所需的反应时更短，且对低效价做出评价的反应时比高效价更短;高唤醒度界面和高效价界面诱发了更大的P2波;低效价界面比高效价界面诱发了更大的N2波;在中央区右半球，低唤醒度界面诱发了更大的LPP波，在中央区左半球，高效价界面诱发的LPP波更大。结论 在情感刺激加工的早期阶段，P2波和N2波可以作为衡量用户情感体验差异的显著指标;在情感刺激的持续加工和编码的晚期阶段，LPP波可以衡量用户情感体验的差异。

The work aims to investigate the users' affective cognition mechanism on mobile news APPs from the perspective of user cognition. The event-related potentials (ERPs) technology was used to explore the users' affective processing process on homepage interfaces of mobile news APPs. In the experiment, the subjects were asked to evaluate the level of valence and arousal which were the two dimensions of affective experience for experimental stimuli, and the behavior and ERPs data were recorded at the same time. The behavioral results showed that the reaction time for arousal evaluation was shorter than that for valence evaluation, and the reaction time for low valence was shorter than that for high valence. The ERPs results showed that enhanced P2 was evoked by high arousal interface than low arousal interface, and greater N2 was found for low valence interface than high valence interface. Furthermore, enhanced LPP were evoked for low arousal interface in the right hemisphere of central region and for high valence interface in the left hemisphere of the central region. In the early stage of emotional stimulus processing, P2 and N2 can be used as significant indicators to measure the difference of users' affective experience; in the late stage of continuous processing and encoding of emotional stimuli, LPP can measure the difference of users' affective experience.