Robson A G, Kulikowski J J
Visual Sciences Laboratory, UMIST, Manchester, UK.
Vision Res. 1998 Nov;38(21):3499-503. doi: 10.1016/s0042-6989(98)00058-3.
The minimum distinct border (MDB) between different isoluminant hues of a bipartite field was set subjectively by adjustment and then according to a 3-point rating allowing determination of the S-cone specific (tritanopic) axis. This rating was compared with visual evoked potentials (VEPs) generated by coarse, isoluminant gratings, modulated along the same chromatic axes. Psychophysically determined tritanopic gratings elicited monophasic onset VEPs with the longest latency for each subject. Departure from this axis produced additional earlier negative components (reflecting additional response mechanisms). Colour-selective VEPs can, therefore, objectively specify tritanopic confusion lines with a comparable degree of accuracy to MDB judgements.
通过调整主观设定二分视野中不同等亮度色调之间的最小差异边界（MDB），然后根据三点评分来确定S-锥体特异性（蓝色盲）轴。将该评分与沿相同色轴调制的粗等亮度光栅产生的视觉诱发电位（VEP）进行比较。心理物理学确定的蓝色盲光栅诱发单相起始VEP，每个受试者的潜伏期最长。偏离该轴会产生额外的早期负成分（反映额外的反应机制）。因此，颜色选择性VEP可以客观地指定蓝色盲混淆线，其准确度与MDB判断相当。
