Grigsby S S, Tsou B H
Logicon Technical Services, Inc., Dayton, OH 45431-7258.
Vision Res. 1994 Nov;34(21):2841-8. doi: 10.1016/0042-6989(94)90053-1.
A variety of recent physiological and psychophysical experiments provide evidence for a large asymmetry between nasal and temporal processing outside of the central 40 degrees of visual field. Binocular processing has also been found to be reduced outside of this region even though the individual left and right eye fields continue to overlap for a full 120 degrees. In an effort to help quantify these findings, monocular and binocular grating and flicker contrast sensitivities were measured in the fovea and in the near and far periphery. The results show a large asymmetry between nasal and temporal retinal grating sensitivity in the far periphery especially at high spatial frequencies. A smaller asymmetry was found for flicker but no differential effect of flicker frequency was found. The summation results are consistent with previous findings in showing greatly reduced binocular processing outside of the central 40 degrees; this is especially true for the grating stimuli. These results are discussed with respect to possible physiological mechanisms.
最近的各种生理和心理物理学实验为视野中央40度以外的鼻侧和颞侧处理之间的巨大不对称提供了证据。即使个体的左眼和右眼视野在整整120度范围内持续重叠，在该区域之外的双眼处理也被发现有所减少。为了帮助量化这些发现，在中央凹以及近周边和远周边测量了单眼和双眼的光栅和闪烁对比度敏感度。结果显示，在远周边尤其是高空间频率下，鼻侧和颞侧视网膜光栅敏感度之间存在巨大不对称。对于闪烁发现了较小的不对称，但未发现闪烁频率的差异效应。总和结果与先前的发现一致，表明在中央40度以外的双眼处理大大减少；对于光栅刺激尤其如此。针对可能的生理机制对这些结果进行了讨论。
