视觉诱发电位作为光栅图案对比度的函数。
The visual evoked potential as a function of contrast of a grating pattern.
作者信息
Campbell F W, Kulikowski J J
出版信息
J Physiol. 1972 Apr;222(2):345-56. doi: 10.1113/jphysiol.1972.sp009801.
Abstract
- It was shown that the potentials evoked by using a grating pattern alternated in phase at 8 Hz is proportional to the logarithm of the supra-threshold contrast. Other functions were considered, but they did not describe the data so parsimoniously.2. The same logarithmic function described the results when a grating was simply flashed on and off; therefore, the apparent movement accompanying the phase alternations is not necessary to evoke the potential.3. The contrast at which the evoked potential reached the theoretically zero voltage (C(0)) was compared with the psychophysical contrast threshold, determined by means of proportion-of-time seen measurements; the C(0) contrast corresponded to 50% time seen.4. The potential, corrected for the proportion-of-time seen, was found linearly related to contrast.
摘要
结果表明，使用以8Hz相位交替的光栅图案诱发的电位与阈上对比度的对数成正比。还考虑了其他函数，但它们对数据的描述没有这么简洁。
当光栅简单地闪烁时，相同的对数函数描述了结果；因此，伴随相位交替的明显运动对于诱发电位不是必需的。
将诱发电位达到理论零电压时的对比度（C(0)）与通过可见时间比例测量确定的心理物理学对比度阈值进行比较；C(0)对比度对应于50%的可见时间。
校正可见时间比例后的电位与对比度呈线性相关。
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