Development of psychophysically-derived detection contours in L- and M-cone contrast space
Development of psychophysically-derived detection contours in L- and M-cone contrast space
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DOI：
10.1016/s0042-6989(01)00070-0
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发表时间：
2001-06-01
期刊：
影响因子：
1.8
通讯作者：
Kelly, J
中科院分区：
文献类型：
--
作者：
Dobkins, KR;Anderson, CM;Kelly, J
为了研究婴儿颜色机制的发展，我们将椭圆检测轮廓拟合到心理物理学衍生的对比阈值上，并绘制在L-和m -锥对比空间中。我们获得了47名婴儿（2-5个月大）的检测椭圆，并将其与在几乎相同条件下测试的6名成年人的检测椭圆进行了比较。拟合椭圆的参数使我们能够解决颜色发展的几个方面。首先，长度和宽度被用来评估相对发展的色度，相对于亮度，灵敏度。这些分析的结果显示，在3到4个月大的时候，颜色敏感性急剧增加，这表明在这个时候，颜色机制的加速发展。其次，椭圆的角度提供了单个红/绿等亮度点的估计。与之前的报道一致，我们发现等亮度点不随年龄而显着变化。最后，我们的椭圆拟合程序被用来评估颜色敏感性是否最好地描述了一个模型，假设在接受后的颜色和亮度机制之间的独立性。与Kelly和Chang先前的研究结果相似[Kelly， j.p. & Chang， S.(2000)]。视觉研究40,1887-1906]使用稳态视觉诱发电位获得，只有一部分（大约一半）的婴儿表现出与独立机制一致的检测轮廓，这一发现很可能是由于婴儿数据集中的统计噪声。2001爱思唯尔科学有限公司版权所有。
In order to investigate the development of color mechanisms in infants we fitted elliptical detection contours to psychophysically-derived contrast thresholds plotted in L- and M-cone contrast space. Detection ellipses were obtained for 47 infants (ages 2-5 months of age), and were compared to those of six adults tested under nearly identical conditions. The parameters of the fitted ellipses allowed us to address several aspects of color development. First, the lengths and widths were used to assess the relative development of chromatic, with respect to luminance, sensitivity. The results of these analyses revealed a sharp increase in chromatic sensitivity between 3 and 4 months of age, suggesting an accelerated development of chromatic mechanisms around this time. Second, the angles of the ellipses provided estimates of individual red/green isoluminance points. In line with previous reports, we found that isoluminance points do not vary significantly with age. Finally, our ellipse-fitting procedures were used to assess whether color sensitivity is best described by a model that assumes independence between post-receptoral chromatic and luminance mechanisms. Similar to previous results of Kelly and Chang [Kelly, J. P. & Chang, S. (2000). Vision Rrsearch 40, 1887-1906] obtained using steady-state visually evoked potentials, only a proportion (approximately half) of our infants exhibited detection contours that were consistent with independent mechanisms, a finding that most likely results from statistical noise in the infant data sets. (C) 2001 Elsevier Science Ltd. All rights reserved.