DEVELOPMENT OF INFANT CONTRAST SENSITIVITY TO CHROMATIC STIMULI
DEVELOPMENT OF INFANT CONTRAST SENSITIVITY TO CHROMATIC STIMULI
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DOI：
10.1016/0042-6989(93)90133-h
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发表时间：
1993-12-01
期刊：
影响因子：
1.8
通讯作者：
FIORENTINI, A
中科院分区：
文献类型：
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作者：
MORRONE, MC;BURR, DC;FIORENTINI, A
我们通过监测13名婴儿的视觉诱发电位（VEPs）来监测对等效红绿色系的对比敏感性的发展。结果证实了我们之前的报告[Morrone， Burr和Fiorentini， Proceedings of The Royal Society B, 242 (1990a)]，即在7-8周龄之前，对纯彩色刺激没有反应，而在同一年龄，20%对比度的亮度刺激产生了可靠的反应。在所有年龄段（甚至在颜色反应开始之前），产生均衡亮度的颜色混合物与成人相似，这表明中波和长波视锥细胞的相对比例和功效对于婴儿和成人是相似的。对于亮度和色度刺激，振幅随对数对比度大致线性增加，因此灵敏度阈值可以通过对横坐标的线性外推来预测。对四名不同年龄的婴儿进行了详细的对比敏感度曲线测量。结果表明，亮度和色彩对比敏感度以不同的速率独立发展，可能反映了感觉后神经机制的差异发展。
We have monitored the development of contrast sensitivity to equiluminant red-green chromatic patterns by monitoring visual evoked potentials (VEPs) in 13 infants. The results confirm our previous report [Morrone, Burr and Fiorentini, Proceedings of the Royal Society B, 242 (1990a)] that, before 7-8 weeks of age, there was no response to purely chromatic stimuli, while at the same age luminance stimuli of 20% contrast produced reliable responses. At all ages (even before the onset of a chromatic response) the colour mixture to yield equiluminance was similar to that of adults, suggesting that the relative proportion and efficacy of medium- and long-wave cones is similar for infants as for adults. For both luminance and chromatic stimuli, amplitude increased roughly linearly with log-contrast, so sensitivity thresholds could be predicted by linear extrapolation to the abscissa. Detailed contrast sensitivity curves were measured for four infants at various ages. The results show that luminance and chromatic contrast sensitivity develop independently at different rates, probably reflecting differential development of postreceptoral neural mechanisms.