以国旗为例的自我参照加工:来自ERPs的证据
首发时间:2013-06-07
摘要:采用事件相关电位考察自我参照效应。采用标准的三类刺激oddball实验模式探索自我参照加工的神经基础。其中大圆是标准刺激,小圆是目标刺激,而三类国旗刺激是分心刺激。实验发现,自我参照刺激诱发的N2波幅比熟悉刺激和不熟悉刺激更小,且在脑区前部最为明显;自我参照刺激比熟悉刺激和不熟悉刺激诱发了更明显的P300,且左脑最明显。结果说明自我参照效应是存在的,相对于已经得到证明的自我相关效应或自我参照效应,本研究运用电生理的方法,验证了自我参照效应及其神经机制。
关键词: 心理学 事件相关电位 自我参照加工 N250 P300
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The Self-Referential Processing Evoked by national flag: An ERPs Study
Abstract:To explore the temporal features and underlying brain structures of self-referential processing, participants were shown examples of national flag by using a three-stimulus oddball paradigm. In the experiment, the task was to observe the stimuli carefully and make behavior response to the small circle. The results showed prominent differences in event-related potentials (ERPs) elicited by self-referential and other conditions in the N150-250 ms and P300-500 ms time windows. First, in the time window between 150ms and 250ms, the self-referential stimulus motivated greater negative wave than other types of stimuli. It may reveal that the individual may begin to retrieve and extract self-referential information in this stage. As for the P300 (300ms-500 ms), the self-referential stimulus evoked greater amplitude, and longer latency than the familiar and unfamiliar ones. It may reveal that the self-referential stimulus which have stronger sense of belonging can activate psychological self, thus they need more cognitive resources, which are used to identify the target stimuli and retrieve more self-referential information. Second, in terms of lateralization and caudality, the wave effect, negative and positive, in the front sites and left hemisphere were the greatest. It may reveal that left prefrontal region plays a crucial role in self-referential processing, and may also showed that self-referential stimulus were processed more elaborately than other stimuli in this region.
Keywords: psychology event-related potentials self-referential processing N250 P300
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