事件性前瞻记忆加工的认知神经机制

The Cognitive and Neural Mechanisms Underlying Event-Based Prospective Memory

摘要: 目的：运用事件相关电位技术研究正常成人事件性前瞻记忆的加工机制。方法：研究对象为20名高校在读研究生，实验任务为双任务范式，分为正在进行的任务(Ongoing task)与前瞻任务(PM task)。系统自动记录被试的反应时及正确率，Neuroscan 32导脑电仪同时记录其脑电特征。结果：前瞻性任务较正在进行的任务在枕区诱发更大的N300(F(1,19) = 215.44, p < 0.001)；前瞻性任务较正在进行的任务诱发更大的前瞻性正波(F(1,19) = 215.44, p < 0.001)。结论：前瞻任务诱发了两种特异性的ERPs成分：N300和前瞻性正波，N300反映了对前瞻线索的察觉，前瞻性正波反映了计划提取后的加工过程。

Abstract: Objective: To study the process mechanisms underlying Event-based Prospective Memory toward event related potentials (ERPs) in healthy subjects. Methods: Event-related brain potentials (ERPs) were recorded from 20 healthy post graduate during an event-based PM paradigm. On ongoing activity trials, a Chinese word in green was presented. The participants’ task was to decide which category the word in green belongs to. In the PM task, the participants were asked to press corresponding button when a word in blue was presented. The RT and Accuracy were recorded automatically. Results: The average amplitude of the N300 is more negative in PM task than that in ongoing activity in the occipital region (F(1,19) = 215.44, p < 0.001). The average amplitude of prospective positive is higher in PM task than that in ongoing activity (F(1,19) = 215.44, p < 0.001). Conclusions: The N300, a component of the ERPs related to PM cue detection. Prospective positivity, a component of the ERPs related to PM intention retrieval.