ISSN 0439-755X
CN 11-1911/B
主办：中国心理学会
　　　中国科学院心理研究所
出版：科学出版社

心理学报 ›› 1987, Vol. 19 ›› Issue (1): 102-106.

• • 上一篇    下一篇

视觉诱发电位(VEP)对不同频率条纹的反差敏感性

金贵昌;郑竺英   

  1. 中国科学院生物物理所,中国科学院生物物理所 北京 ,北京
  • 出版日期:1987-03-25 发布日期:1987-03-25
  • 通讯作者: 金贵昌

VISUAL—EVOKED POTENTIALS ON CONTRAST SENSITIVITY

Jin Guichang;Zheng Zhuying Institute of Biophysics, Academia Sinica   

  • Published:1987-03-25 Online:1987-03-25

摘要： 本实验利用条纹发生器产生正弦调制的条纹作视觉刺激,用NICOLETCA—1000平均仪,从枕骨隆起上方沿中线5cm处记录瞬态视觉诱发电位。实验用四种不同反差,十种空间频率,四名被试。结果表明瞬态视觉诱发电位(C_1—C_2)的峰值随反差的增加而变化,其在空间频率上有一定的分布,最敏感处落在3—5C/deg。在阈上刺激时,被试个体有差异,但分布趋势相似,最敏感处也为3—5C/deg,这和心理物理实验获得的调制传递函数(MTF)结果很吻合。从实验结果可以看到(C_1—C_2)值对反差变化是敏感的,它反映了人视觉系统对不同空间频率上的反差敏感性,可以把它与MTF相类比。

关键词: NULL

Abstract: Gratings, the luminance profiles of which varied sinusoidally, wereflashed and displayed on a monitor. An electrode recording thetransient visual-evoked potential was placed 5 cm above inion. Fourhealthy subjects wete tested on four levels of contrast of gratings atten spatial frequencies and VEP was recorded by NICOLET CA-1000system. The result shows that amplitude of (C_1-C_2)differs with differentspatial frequencies, and becomes larger as contrast increases. The maximum amplitude of VEP is at approximately 3-5 c/deg,which tallies with the results of Modulation Transfer Function (MTF)obtained in psychophysical experiment. It is found that the amplitude of(C_1-C_2)is sensitive to contrast change. From VEP, one can see that in human visual system, sensitivitydiffers with different spatial frequencies, which is similar to the resultsof MTF.

Key words: NULL