Kelly D H
Visual Sciences Program, SRI International, Menlo Park, California 94025.
J Opt Soc Am A. 1990 Dec;7(12):2237-44. doi: 10.1364/josaa.7.002237.
This paper reports an extended study of anomalous (enhanced) sensitivity to moving gratings in the range of 1-10 cycles per degree, at high temporal frequencies (greater than 20 Hz), i.e., in the high-frequency corner of the spatiotemporal threshold surface. The effect is very robust. All subjects (n = 5) show the effect with moving or flickering gratings and with or without stabilization of the retinal image. After eliminating various types of potential artifacts, the phenomenon was finally attributed to a form of transient destabilization associated with microsaccadic eye movements. In the unstabilized condition, microsaccades and voluntary saccades both interact with the grating motion to produce visible flashes. With image stabilization, the (1-msec) delay of the Purkinje-image eyetracker interacts with these saccades in a way that increases the visibility of the associated flashes. The form of the threshold data suggests that the size of the saccades may vary with the spatial period of the moving grating.
本文报告了一项扩展研究，该研究针对在高时间频率（大于20Hz）下，即时空阈值表面的高频角落处，对每度1 - 10个周期范围内的移动光栅的异常（增强）敏感性。该效应非常稳健。所有受试者（n = 5）在移动或闪烁光栅以及视网膜图像稳定或不稳定的情况下均表现出该效应。在消除各种潜在伪影后，该现象最终归因于与微扫视眼动相关的一种短暂不稳定形式。在不稳定条件下，微扫视和自主扫视均与光栅运动相互作用以产生可见闪光。通过图像稳定，浦肯野图像眼动追踪器的（1毫秒）延迟以增加相关闪光可见度的方式与这些扫视相互作用。阈值数据的形式表明，扫视的大小可能随移动光栅的空间周期而变化。
