Source locations of pattern-specific components of human visual evoked potentials. I. Component of striate cortical origin
Source locations of pattern-specific components of human visual evoked potentials. I. Component of striate cortical origin
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DOI：
10.1007/bf00233371
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发表时间：
2004
影响因子：
2
通讯作者：
D. Jeffreys;J. Axford
中科院分区：
文献类型：
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作者：
D. Jeffreys;J. Axford
本文研究了在连续照明的漫射场中，由一个图形在不同区域的短暂呈现所诱发的人头皮记录电位的横向分布。这些视觉诱发电位（VEP）的前两个分量，指定为C. I.（潜伏期65-80毫秒）和C. II（潜伏期90-110毫秒），都极大地影响了视网膜位置的刺激模式。在对12名受试者的VEP波形进行初步研究后，对其中4名受试者的VEP波形各分量的分布进行了更详细的研究，结果发现：1.对应峰（C. I和C。2.在左、右半野VEP中，C.我，但不是C。II，在中线上显示极性反转。4.受试者的左右不对称程度不同。象限和上下半视野VEP的个体间一致性也比全视野或左右半视野VEP的个体间一致性大得多。结果表明，半视野VEP分布与组成象限VEP分布之间存在着相加关系。I和C。两个源在空间上是分开的。假设一个简单的偶极模型的基础上已知的视网膜组织的纹状皮质，它表明，测量的分布是兼容的假设，即组件C。我，但不是C。Ⅱ型起源于纹状皮质，来自表面负性皮质活动。
A study was made of the transverse distributions of human scalprecorded potentials evoked by the brief presentation of a pattern into different regions of a continuously illuminated diffuse field. The first two components of these visual evoked potentials (VEPs), designated C.I. (latency 65–80 msec) and C. II (latency 90–110 msec), were both greatly influenced by the retinal location of the stimulus pattern. In an initial study of the VEP waveforms with 12 subjects, followed by a more detailed investigation of the distribution of the individual components in 4 subjects, the following results were found.1.Corresponding peaks (C. I and C. II) of the VEPs to stimulation of the upper and lower half-fields were inverted in polarity.2.For the left and right half-field VEPs, the transverse distribution of C. I, but not of C. II, showed a polarity reversal across the midline.3.Consistent differences were observed between the distributions of C. I for adjacent upper and lower quadrants, as well as between those for adjacent horizontal and vertical octants of the upper field.4.Subjects differed in the degree of left-right asymmetry shown. There was also a much greater degree of interindividual consistency of quadrant and upper and lower half-field VEPs than for full-field or left and right half-field responses.5.For C. I, an additive relationship was demonstrated between the half-field and the constituent quadrant VEP distributions.These results indicate that C. I and C. II have spatially separate sources. Assuming a simple dipolar model based on the known retinotopic organization of the striate cortex, it is shown that the measured distributions are compatible with the hypothesis that component C. I, but not C. II, originates in striate cortex, from surface negative cortical activity.