Tulunay-Keesey U, VerHoeve J N
Department of Ophthalmology, University of Wisconsin, Madison 53705.
Vision Res. 1987;27(5):747-54. doi: 10.1016/0042-6989(87)90072-1.
The roles of small eye movements of fixation, and of different kinds of background in motion detection were studied. Minimum detectable displacement for a luminous line oscillating either in a blank field or in the presence of three types of background was measured under two viewing conditions: normal, when eye movements generate normal movements of the image on the retina, and stabilized when these retinal image movements were nearly eliminated. It was demonstrated that eye movements enhance motion detection for a sinusoidally moving target when the target is superimposed on a patterned background; they are detrimental when there is no background. In addition, it was found that the function relating threshold amplitude to frequency of movement is band-pass when the image is stabilized or when the bar moves on a blank field, and is more low-pass when both the background and the test target are subject to the effects of eye movements.
研究了注视时小眼球运动以及不同类型背景在运动检测中的作用。在两种观察条件下测量了在空白视野或存在三种类型背景时振荡的发光线的最小可检测位移：正常条件下，眼球运动使视网膜上的图像产生正常运动；稳定条件下，这些视网膜图像运动几乎被消除。结果表明，当目标叠加在有图案的背景上时，眼球运动增强了对正弦运动目标的运动检测；当没有背景时，眼球运动则起有害作用。此外，还发现当图像稳定或线条在空白视野上移动时，将阈值幅度与运动频率相关的函数是带通的，而当背景和测试目标都受到眼球运动影响时，该函数更接近低通。
