Spekreijse H, Dagnelie G, Maier J, Regan D
Vision Res. 1985;25(9):1297-304. doi: 10.1016/0042-6989(85)90045-8.
A counterphase-modulated (i.e. contrast reversing) pattern will affect hypothetical neural elements sensitive to motion as well as hypothetical elements sensitive to changes in contrast and other elements sensitive to local luminance. Attempts to describe visual evoked potentials (VEPs) to contrast reversal entirely in terms of luminance change or entirely in terms of contrast change have been unsuccessful; strong interactions between responses to contrast decrease and increase had to be postulated ad hoc in order to account for the contrast reversal VEP, and no explanation for these interactions has been proposed. Rather than attempting to separate the reversal VEP into responses to contrast decrease and increase, we attempt here to analyze the reversal VEP into responses to motion onset and offset. We find that VEPs to an abrupt displacement of less than one square's width of a checkerboard pattern are qualitatively similar to the contrast reversal VEP, and that the displacement VEP can be seen as the limiting case of a motion onset response shortly followed by a motion offset response. When displacement occurs during steady motion, the displacement and motion responses interact. We conclude that the contrast reversal VEP is better described in terms of motion onset and offset response than in terms of contrast onset and offset responses.
一种反相调制（即对比度反转）模式会影响对运动敏感的假设神经元成分，以及对对比度变化敏感的假设成分和对局部亮度敏感的其他成分。试图完全根据亮度变化或完全根据对比度变化来描述对比度反转的视觉诱发电位（VEP）都没有成功；为了解释对比度反转VEP，不得不特设假设对比度降低和增加的反应之间存在强烈相互作用，但尚未对这些相互作用提出解释。我们在此不是试图将反转VEP分离为对对比度降低和增加的反应，而是试图将反转VEP分析为对运动开始和结束的反应。我们发现，对棋盘格图案小于一个方格宽度的突然位移的VEP在质量上与对比度反转VEP相似，并且位移VEP可以被视为紧接着运动结束反应的运动开始反应的极限情况。当在稳定运动期间发生位移时，位移和运动反应会相互作用。我们得出结论，用运动开始和结束反应来描述对比度反转VEP比用对比度开始和结束反应更好。
