Second-site adaptation in the red-green detection pathway: only elicited by low-spatial-frequency test stimuli.
Second-site adaptation in the red-green detection pathway: only elicited by low-spatial-frequency test stimuli.
复制标题
红绿检测途径中的第二位点适应：仅由低空间频率测试刺激引起。
DOI：
10.1016/s0042-6989(98)00328-9
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发表时间：
1999
期刊：
影响因子：
1.8
通讯作者：
Kronauer,RE
中科院分区：
文献类型：
--
作者：
Stromeyer3rd,CF;Gowdy,PD;Chaparro,A;Kronauer,RE
通过测量0.8-6 c deg− 1的正弦波测试光栅在黄色或红色亮适应场的L和M锥对比平面中的阈值检测轮廓，揭示了红绿（RG）检测机制。RG检测轮廓的斜率是一致的，表明L和M对比度信号在黄色和红色区域上的贡献相等（符号相反）;这反映了第一位点视锥细胞选择性适应。第二个网站的适应，这可能会反映饱和度在一个颜色的对手网站，证明了RG检测轮廓进一步从原点的锥对比度平面上的红色字段比黄色字段。对于低空间频率的测试光栅，第二位置适应性很强（3倍），但大大降低了6 c deg−1。随着空间频率的增加，第二位点适应的消失可以用空间频率通道来解释。最灵敏的检测器可以包括低空间频率通道，其易于被红场的彩色空间DC分量掩蔽。6 c deg− 1模式可由较不敏感、较高频率的通道检测，该通道受均匀红场的影响较小。RG空间频率通道可能出现在皮层中，暗示第二位点效应的部分中心位点。
The red–green (RG) detection mechanism was revealed by measuring threshold detection contours in the L and M cone contrast plane for sine-wave test gratings of 0.8–6 c deg−1on bright adapting fields of yellow or red. The slope of the RG detection contours was unity, indicating that the L and M contrast signals contribute equally (with opposite signs) on both the yellow and the red fields; this reflects first-site, cone-selective adaptation. Second-site adaptation, which may reflect saturation at a color-opponent site, was evidenced by the RG detection contours being further out from the origin of the cone contrast plane on the red field than on the yellow field. Second-site adaptation was strong (3-fold) for low spatial frequency test gratings but greatly diminished by 6 c deg−1. The disappearance of second-site adaptation with increasing spatial frequency can be explained by spatial frequency channels. The most sensitive detectors may comprise a low spatial frequency channel which is susceptible to masking by the chromatic, spatial DC component of the red field. The 6 c deg−1patterns may be detected by a less sensitive, higher frequency channel which is less affected by the uniform red field. The RG spatial frequency channels likely arise in the cortex, implicating a partially central site for the second-site effect.