2 NEW PROPERTIES OF FOVEAL AFTER-IMAGES AND A PHOTOCHEMICAL HYPOOTHESIS TO EXPLAIN THEM
2 NEW PROPERTIES OF FOVEAL AFTER-IMAGES AND A PHOTOCHEMICAL HYPOOTHESIS TO EXPLAIN THEM
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DOI：
10.1113/jphysiol.1962.sp007011
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发表时间：
1962-01-01
影响因子：
5.5
通讯作者：
BRINDLEY, GS
中科院分区：
文献类型：
--
作者：
BRINDLEY, GS
如果一个短暂的和非常明亮的闪光投射在中央凹上，其负后像首先显示出清晰的空间细节，但在接下来的15-20分钟内逐渐变得模糊。深红色刺激的绿色后像的模糊比较短波长刺激的粉红色后像快得多。它不会发生在额外的中央凹后的图像。模糊不清不仅仅是由于褪色，而且与刺激后眼睛是否处于黑暗、明亮或交替的黑暗和明亮中无关。橙红色或橙子闪光的负余像是粉红色的，但被一个明显的绿色光晕包围，该光晕至少在15分钟内保持可见。如果在闪光中加入短波长的光，则余像的颜色不受影响，但绿色晕在2分钟内不出现或消失。图像完全取决于锥状色素的光解产物，所述锥状色素从产生它们的锥状细胞扩散，并降低相同光谱类型的其它锥状细胞的灵敏度。这一假说解释了余像的模糊和观测到的绿色晕的所有性质。
If a brief and very bright flash of light is cast on the fovea, its negative after-image shows sharp spatial detail at first, but becomes progressively blurred during the following 15-20 min. The blurring is substantially faster for the green after-images of deep red stimuli than for the pink after-images of stimuli of shorter wavelength. It does not occur in extra-foveal after-images. The blurring is not merely due to fading, and is independent of whether, after the stimulus, the eye is kept in darkness, in light, or in alternating darkness and light. The negative after-image of an orange-red or orange flash is pink, but is surrounded by a conspicuous green halo which remains visible for at least 15 min. If light of short wave-length is added to flash, the colour of the after-image is unaffected, but the green halo either does not appear or disappears within 2 min. It is suggested that late foveal after-images depend wholly on products of photolysis of cone pigments, which diffuse from the cones in which they were produced and decrease the sensitivity of other cones of the same spectral type. This hypothesis explains the blurring of after-images and all the observed properties of the green halo.