目的：采用事件相关电位（ERP）技术探讨情绪对两可图认知加工的影响。方法：通过成功-失败操纵（SFM）诱发情绪,考察两可图观察任务的脑电活动变化。结果：①刺激产生的ERPs各成分（N140、N200、P300、N400）明显。②负性情绪组N140、N200潜伏期显著延迟,波幅显著减小。③负性和中性情绪组P300波幅显著大于正性情绪组。④负性情绪组N400潜伏期显著长于中性情绪组,负性和中性情绪组波幅均显著大于正性情绪组。结论：① N140和N200可能反映两可图物理刺激的感知;P300和N400则可能反映两可图的命名及含义转换。② N140和N200潜伏期显著延迟,波幅显著减小,说明负性情绪可能导致被试脑活动呈现抑制状态,活动水平降低。③ P300和N400波幅显著增大,可能是受高趋近动机影响,被试对任务投入更多心理资源,故负性情绪反而提高了激活水平。

Objective To discuss on the impact of different emotions on ambiguous figure processing by using event-related potential（ERP） technology. Methods The success-failure manipulation was used to induce different emotions. The changes of brain electric activity affected by the ambiguous figure processing were observed. Results The ERPs components（N140,N200, P300, N400） produced by stimuli were significant. The latency of N140, N200 in negative emotion group was significantly delayed, and the amplitude significantly decreased. The amplitude of P300 in negative and neutral emotion groups was significantly larger than that in positive emotion group. The latency of N400 in negative emotion group was significantly longer than that in neutral emotion group, and the amplitude in negative and neutral emotion groups was significantly greater than that in positive emotion group. Conclusion In the ambiguous cognition processing, N140 and N200 may reflect the perception of ambiguous physical stimuli, while P300 and N400 may reflect the process of ambiguous figure naming and the conversion of meaning. The latency of N140, N200 in negative emotion state is significantly delayed,and the amplitude significantly reduces, which indicates that the negative emotion may induce the state of suppression and lower level of brain activity. The amplitudes of P300 and N400 are significantly greater, which may be due to high approach motivational effects of the task. Participants invest more psychological resource in the task, and the negative emotion increases the activation level.