大中学生对悲伤与愉快面孔区分的特征比较

采用面孔识别研究范式和事件相关电位方法,研究初中生、高中生和大学生三个年龄段被试情绪面孔加工特征。研究发现,在刺激呈现后的550~800ms,三个年龄段被试均产生悲伤效应,悲伤面孔引发的LPC波幅大于愉快面孔引发的LPC波幅,三个年龄段的悲伤效应脑区分布大致相同,表明三个年龄段情绪面孔加工有着类似的神经机制。进一步比较三个年龄段悲伤面孔引发的ERPs发现,在刺激呈现后的200~550ms,悲伤面孔的加工产生年龄效应。年龄段越低的被试N2波幅越大,年龄段越高的被试P3波幅越大。这一结果提示,随着年龄的增长,青少年大脑高级功能的发育日趋成熟。

The Features of Sad-Happy Faces Discrimination in Secondary Schools and Universities

The paper applied the event-related potentials studies and facial discrimination pattern to discuss the characteristics of facial expression processing of students in secondary schools and universities.From the research we could see that sad effects presented at 550~800 millisecond after stimulus in three age periods.And the amplitude of LPC of sad faces was stronger than that of happy faces,which indicated that similar neural mechanism of facial expression processing exist in three age periods.In addition,by comparing ERPs of sad expression in three age periods,we found that the younger subjects were,the stronger the amplitude of N2 was.The older subjects were,the stronger the amplitude of P3 was.The result indicated that with growth,adolescents' ability of emotion regulation and advanced brain function become better.