Skottun Bernt C, Skoyles John R
Skottun Research, Oakland, California, USA.
Vis Neurosci. 2007 Mar-Apr;24(2):177-81. doi: 10.1017/S0952523807070228.
In metacontrast a masking stimulus reduces the visibility of an adjacent target stimulus. This effect has been interpreted in terms of magno-/parvocellular interactions. It has also been found that a second masking stimulus, which precedes the primary mask by about 90 ms reduces the masking effect. This reduction, which is termed "target recovery," has been hypothesized to reflect parvocellular inhibition of the magnocellular system. However, this is problematic because the time course of this effect is much larger than would be expected from magno-/parvocellular interactions. For this and other reasons, it is difficult to understand metacontrast in terms of magno- and parvocellular mechanisms.
在元对比中，一个掩蔽刺激会降低相邻目标刺激的可见性。这种效应已根据大细胞/小细胞相互作用进行了解释。还发现，在主要掩蔽刺激之前约90毫秒出现的第二个掩蔽刺激会降低掩蔽效应。这种降低被称为“目标恢复”，据推测这反映了小细胞对大细胞系统的抑制。然而，这存在问题，因为这种效应的时间进程比大细胞/小细胞相互作用所预期的要长得多。由于这个以及其他原因，很难从大细胞和小细胞机制的角度来理解元对比。
