Reeves A
Perception. 1986;15(2):163-72. doi: 10.1068/p150163.
Rod and cone targets were crossed, in every combination, with rod and cone masks in flanking-bars metacontrast. Strong type-B (U-shaped) metacontrast was obtained in each condition, contrary to the claim that rod and cone masking are independent. In each condition, visibility declined steadily with stimulus-onset asynchrony (SOA) in trials in which target and mask appeared to be simultaneous, and increased with SOA in trials in which they appeared to be successive. The 'U' results from collapsing across these different types of trials, which may reflect distinct monotonic processes in masking. Under the light adaptation conditions used the time, Tmax, at which metacontrast was at a maximum was delayed by about 25 ms if rods, rather than cones, detected the target. Whether rods or cones detected the mask hardly altered Tmax.
在侧翼条带元对比中，视杆细胞和视锥细胞靶标与视杆细胞和视锥细胞掩蔽以各种组合交叉呈现。在每种情况下均获得了强烈的B型（U形）元对比，这与视杆细胞和视锥细胞掩蔽相互独立的说法相反。在每种情况下，当目标和掩蔽看起来同时出现的试验中，可见度随刺激起始异步性（SOA）的增加而稳步下降；而在它们看起来相继出现的试验中，可见度则随SOA的增加而增加。这些“U”形结果是通过对这些不同类型试验的数据进行汇总得到的，这可能反映了掩蔽过程中不同的单调变化过程。在所采用的明适应条件下，如果是视杆细胞而非视锥细胞检测到目标，元对比达到最大值的时间Tmax会延迟约25毫秒。视杆细胞还是视锥细胞检测到掩蔽对视杆细胞检测到目标时，元对比达到最大值的时间Tmax几乎没有影响。
