|
|
视觉注意范围的调控机制
The Mechanism of Gain in Scale of Visual Attention
查看参考文献5篇
|
文摘
|
目的 使用固定位置的位置性注意范围提示，研究注意范围的脑内时程的动态变化。方法 被试者为12名健康右利手青年人，视觉刺激序列为：背景-提示-靶刺激。提示物为一个圆，有3种大小，其圆心均在屏幕中点。要求被试在提示范围内寻找靶刺激并判断其朝向。同时记录反应时和128导脑电（EEG）数据。结果 随着注意范围的扩大，对同等位置靶刺激的反应时缩短；靶刺激诱发ERP的P1、N1不受提示范围大小的影响，而其后部P2波幅与注意范围显著相关，前部N2的波幅随注意范围的扩大而增大。结论1）视觉注意诱发的P1、N1成分，主要与空间方位信息的加工相关；2）提示物诱发的P2、N2成分与注意范围相关，其机制与注意方位的增益机制类似；3）在视觉信息加工过程中，注意方位信息要早于注意范围信息被加工，支持这两者间串行加工的观点。 |
|
其他语种文摘
|
Objective To compare the cortical mechanisms associated with the visual spatial attention directed by fixed location cues. Method The subjects were 12 healthy right-handed young volunteers. The visual stimuli were presented with the sequence as: background-cue-target. The cue was a black circle varied in three different sizes randomly. The foci of the circles were always at the center of the screen. The task of the subjects was to search the target within the cue circle and discriminate its orientation. Electroencephalogram (EEG) was recorded from 128 scalp sites. Result The reaction time(RT) to the targets in the same location shortened when the cue size enlarged. The target evoked P1 and N1 components were not affected by the attentive region size enlarged. Conclusion 1) The P1 and N1 components under visual attention were related to the spatial location processes mainly. 2) Cue-evoked P2 and N2 components were related to the size of attentive region. 3) The processes of spatial location information were earlier than attentive scale information, which supported the theory that spatial selection is a prerequisite for correct processes of visual object information. |
|
来源
|
航天医学与医学工程
,2002,15(3):210-211 【扩展库】
|
|
关键词
|
视觉空间注意
;
范围等级
;
增益机制
;
事件相关电位
|
|
地址
|
中国科学院心理研究所, 北京, 100101
|
|
语种
|
中文 |
|
文献类型
|
研究性论文 |
|
ISSN
|
1002-0837 |
|
学科
|
特种医学 |
|
基金
|
中国科学院“百人计划”项目
;
中国科学院知识创新工程重大项目
;
国家自然科学基金
|
|
文献收藏号
|
CSCD:1003058
|
参考文献 共
5
共1页
|
|
1.
Hillyard S A. Event-related brain potentials in the study of visual selective attention.
Proc Natl Acad Sci USA,1998,95(2):781-787
|
CSCD被引
47
次
|
|
|
|
|
2.
高文斌. 固定位置区域提示下视觉注意范围等级的ERP研究.
心理学报,2002,34(5):443-450
|
CSCD被引
7
次
|
|
|
|
|
3.
Albright T D. Cognitive neuroscience.
Current Opinion in Neurobiology,2000,10:612-624
|
CSCD被引
6
次
|
|
|
|
|
4.
Luo Y J. Dynamics of the spatial scale of visual attention revealed by brain event-related potentials.
Cognitive Brain Research,2001,12:371-381
|
CSCD被引
18
次
|
|
|
|
|
5.
Mangun G R. Sustained visual-spatial attention produces costs and benefits in response time and evoked neural activity.
Neuropsycholoria,1998,36(3):189-200
|
CSCD被引
4
次
|
|
|
|
|
|
了解气象卫星更多信息，请访问