Skrandies W
Hum Neurobiol. 1985;4(2):97-9.
Contrast sensitivity functions of foveal and of perifoveal upper and lower hemiretinal regions were measured in a population of twenty subjects. Foveal stimuli yielded consistently higher contrast sensitivities as well as a shift of the maximal sensitivity towards higher spatial frequencies as compared to perifoveal stimuli. The upper hemiretinal area was more sensitive at all spatial frequencies tested than the corresponding lower hemiretinal area. The statistical comparisons were highly significant, indicating not only regional retinal differences in visual acuity as reflected by the different contrast threshold levels at the highest spatial frequency, but also global differences between the upper and lower hemiretina systems not restricted to certain spatial frequency channels.
在20名受试者群体中测量了中央凹以及中央凹周围上、下半视网膜区域的对比敏感度函数。与中央凹周围刺激相比，中央凹刺激始终产生更高的对比敏感度，并且最大敏感度向更高空间频率偏移。在所有测试的空间频率下，上半视网膜区域比相应的下半视网膜区域更敏感。统计比较具有高度显著性，这不仅表明在最高空间频率下不同对比阈值水平所反映的视网膜区域视力差异，还表明上、下半视网膜系统之间的整体差异并不局限于某些空间频率通道。
