Shevell Steven K, Monnier Patrick
Department of Psychology and Ophthalmology & Visual Science, University of Chicago, Chicago, Illinois 60637, USA.
Vis Neurosci. 2006 May-Aug;23(3-4):567-71. doi: 10.1017/S0952523806233303.
This study investigated chromatic induction from inhomogeneous background patterns. Previous work showed that a background pattern detected by only S cones induced strong color shifts in a nearby test area (Monnier & Shevell, 2003). In that work, the S-cone patterns were composed with constant L- and M-cone stimulation over the entire background; in terms of L and M cones, therefore, the background was uniform. S-cone stimulation was varied over space to produce S-cone-isolated background patterns. These S-cone patterns, however, established spatial structure (the pattern) at both the receptoral level (S-cone stimulation) and the postreceptoral level (S/(L+M)). Here, these two levels of pattern representation were unconfounded to determine whether color shifts induced by S-cone patterns were due to spatial structure within an S-cone-specific neural pathway versus a pathway that combines responses from S cones and other cone types (e.g. S/(L+M)). The results showed that the induced color shifts were mediated by signals within a pathway that combines responses from multiple cone types. These results are consistent with a +s/-s spatially antagonistic neural receptive field, which is found in some neurons in V1 and V2.
本研究调查了来自非均匀背景图案的颜色诱导。先前的研究表明，仅由S视锥细胞检测到的背景图案会在附近的测试区域引起强烈的颜色偏移（莫尼尔和谢维尔，2003年）。在该研究中，S视锥细胞图案是在整个背景上由恒定的L视锥细胞和M视锥细胞刺激组成的；因此，就L视锥细胞和M视锥细胞而言，背景是均匀的。S视锥细胞刺激在空间上变化以产生S视锥细胞孤立的背景图案。然而，这些S视锥细胞图案在感受器水平（S视锥细胞刺激）和感受器后水平（S/（L+M））都建立了空间结构（图案）。在这里，这两个图案表征水平被区分开来，以确定由S视锥细胞图案引起的颜色偏移是由于S视锥细胞特异性神经通路内的空间结构，还是由于结合了S视锥细胞和其他视锥细胞类型（如S/（L+M））反应的通路。结果表明，诱导的颜色偏移是由结合多种视锥细胞类型反应的通路内的信号介导的。这些结果与在V1和V2的一些神经元中发现的+s/-s空间拮抗神经感受野一致。
