Stabell B, Stabell U
Department of Psychology, University of Oslo, Norway.
Vision Res. 1993 Jan;33(2):195-201. doi: 10.1016/0042-6989(93)90157-r.
Using a Wright colorimeter, absolute threshold, absolute form threshold and specific form threshold were measured during long-term dark adaptation in the extrafoveal retina. The specific form threshold was found to fall markedly at about the cone-rod break but thereafter rose steeply. Furthermore, during the rod phase of the dark adaptation the form percept of the small, slender rectangular test field changed qualitatively from a line or rectangle to a circular field at all mesopic intensities. The results indicate that light signals from rods may both facilitate and suppress cone-mediated information about form, and that the rod system may completely dominate the perception of form several log units above the absolute dark-adapted cone threshold when the eye is dark adapted.
使用赖特色度计，在视网膜中央凹外视网膜的长期暗适应过程中测量绝对阈值、绝对形状阈值和特定形状阈值。发现特定形状阈值在大约视锥-视杆细胞转折点处显著下降，但此后急剧上升。此外，在暗适应的视杆细胞阶段，在所有中间视觉强度下，小的细长矩形测试场的形状感知从线条或矩形定性地变为圆形场。结果表明，来自视杆细胞的光信号可能既促进又抑制视锥细胞介导的形状信息，并且当眼睛处于暗适应状态时，视杆细胞系统在比绝对暗适应视锥细胞阈值高几个对数单位的情况下可能完全主导形状感知。
