Effect of stimulus localisation on motion-onset VEP
Effect of stimulus localisation on motion-onset VEP
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DOI：
10.1016/j.visres.2004.07.002
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发表时间：
2004-12-01
期刊：
影响因子：
1.8
通讯作者：
Kubová, Z
中科院分区：
文献类型：
--
作者：
Kremlácek, J;Kuba, M;Kubová, Z
可靠的运动诱发视觉诱发电位（背流激活的结果）被记录在20个不同位置的运动刺激下，时间频率为5周期/秒，偏心距视野外围达42度。对10例受试者枕区（O-Z和距O-Z左右5 cm的两个衍生区）和中脑区（C-Z）的正-负-正（P1-N1-P2; 84-144-208 ms）复合体的振幅和潜伏期进行了评估。我们观察到：(1)N1潜伏期向视野周边方向缩短。(2) N1振幅最大值和潜伏期最小值随着刺激从视野中心向视野外围移动而从枕区向中央区移动（C-Z衍生）。(3)当视野下部受到刺激时，P1和N1峰的振幅明显增大，潜伏期明显缩短。(4) N1峰的最大振幅随偏心距的变化而变化。直到17，它对应于“光辐射”的纹状投影，而更多的是在外围，有更高振幅和更短潜伏期的矛盾侧化。视网膜异位依赖性表明，运动响应包括位置信息，运动诱发的vep并不仅仅产生于高级外脑区（MT或MST）。(C) 2004 Elsevier Ltd.版权所有。
Reliable motion-onset visual evoked potentials (result of the dorsal stream activation) were recorded to motion stimuli with the temporal frequency of five cycles per seconds in 20 different locations with eccentricity up to 42degrees to periphery of the visual field. Amplitudes and latencies of the positive negative-positive (P1-N1-P2; 84-144-208 ms) complex were evaluated in occipital (O-Z and two derivations 5 cm to the left and right from O-Z) and central region (C-Z) in 10 subjects.We observed: (1) Shortening of the N1 latency toward periphery of the visual field. (2) The N1 amplitude maximum and latency minimum moved from occipital into central region (C-Z derivation) as stimulus moved from centre toward periphery of visual field. (3) The P1 and N1 peaks displayed significantly greater amplitudes and shorter latencies when the lower part of the visual field was stimulated. (4) The N1 peak changed lateralisation of its maximum amplitude in dependence on the eccentricity. Up to 17, it corresponds to striate projection of the "optic radiation" whilst more in periphery, there was paradoxical lateralisation of higher amplitude and shorter latency. The retinotopic dependence shows that the motion response includes position information and that the motion-onset VEPs are not generated solely in the higher extrastriate areas (MT or MST). (C) 2004 Elsevier Ltd. All rights reserved.