Orban G A, Orban L C
Doc Ophthalmol. 1985 Oct 30;61(1):7-16. doi: 10.1007/BF00143210.
Rapid sweeping of contrast modulates the steady-state visual evoked potentials (VEP) obtained by sinusoidal gratings reversing at 16 Hz. The modulation results in a null interval of which the width measures the contrast threshold and of which the delay measures the apparent latency of the steady-state VEP, provided that the dynamic contrast sensitivity is symmetric. Data from 25 normal subjects and 27 patients with head injury show that this requirement is met in normal subjects but is often not verified in pathologic conditions. By measuring three aspects of the response to contrast changes (latency and static and dynamic contrast sensitivity) at five different spatial frequencies, one obtains a very sensitive method for investigation of the visual system.
快速扫描对比度会调制由以16Hz反转的正弦光栅获得的稳态视觉诱发电位（VEP）。如果动态对比度敏感度是对称的，这种调制会产生一个零间隔，其宽度测量对比度阈值，其延迟测量稳态VEP的表观潜伏期。来自25名正常受试者和27名头部受伤患者的数据表明，正常受试者满足这一要求，但在病理情况下往往无法得到验证。通过在五个不同空间频率下测量对对比度变化的反应的三个方面（潜伏期以及静态和动态对比度敏感度），可以得到一种非常灵敏的视觉系统研究方法。
