应用Neuroscan脑电记录系统评价概念相似汉字与图片加工的事件相关电位差异

Difference in event-related potentials between conceptually similar Chinese words and pictures:Evaluation using Neuroscan electroencephalogram recording system

背景:已经证明大脑对具体的词和抽象的词处理方式是不一样的,许多事件相关电位实验证明脑对图片和文字的信息处理也是不同的。目的:以事件相关电位验证概念相似的汉字和图片在大脑中的处理模式是否相同。设计、时间及地点:2007-09/2008-01在蓝天学院信息技术研究所完成多刺激物的Oddball实验模式。受试者:被试为12名健康大学生,男生8名,女生4名,平均年龄22岁。刺激材料包括5个物体图片和5个概念相关的中文词,出现概率均为10%。方法:一次实验全过程包含2个子实验,在实验1中,以图片为靶刺激,相关的中文词作为相关非靶刺激,其他的为非靶刺激;而在实验2中将中文词作为靶刺激,相关的图片作为相关非靶刺激。采用心理数数的方式计算靶刺激,通过Neuroscan脑电记录系统进行诱发电位的采集、放大和处理。主要观察指标:受试者对靶刺激和非靶刺激是否会产生P300,以及P300的波幅。结果:实验1中靶刺激诱发出明显的P300,相关非靶刺激和其他非靶刺激未能诱发明显的P300。实验2靶刺激和相关非靶刺激都诱发出明显的P300,尽管相关非靶刺激诱发的波幅比较小,其他非靶刺激未能诱发P300。结论:2个实验出现不同的效果表明有概念联系的图片和中文词在大脑中存在不同的处理模式。

BACKGROUND： It has been demonstrated that concrete word and abstract word processing is different in human brain, and many event related potential also proves conceptually similar Chinese words and pictures processing is different in human brain. OBJECTIVE： To examine whether conceptually similar Chinese words and pictures processing is identical in human brain using event related potential. DESIGN, TIME AND SETTING： The Oddball experiment was performed at the Institute of Information and Technology of Jiangxi Bluesky University between September 2007 and January 2008. PARTICIPANTS： Twelve healthy university students, 8 males and 4 females with an average age of 22 years, were included. Stimulating materials included 5 pictures and 5 concept-related Chinese words; the appearance possibility was 10%. METHODS： One trial consisted of two subtests. In trial 1, pictures served as target stimuli, Chinese words as related non-target stimuli, and other stimuli as non-target stimuli. In trial 2, Chinese words served as target stimuli, and pictures as related non-target stimuli. Number of the target stimuli was counted by the participants, and evoked potential collection, magnification and processing were performed using Neuroscan electroencephalogram recording system. MAIN OUTCOME MEASURES： Whether target and the non-target stimuli could elicit P300 and the amplitude of P300. RESULTS： In trial 1, the target stimulus elicited a large P300, the related non-target stimulus and non-target failed to elicit a P300. In trial 2, only word target and the non-target picture elicited large P300, though the P300 to the related non-target was smaller in amplitude. CONCLUSION： The difference results of two trials show that conceptual similar pictures and Chinese words have different processing modes in human brain.