Spatial frequency tuned covariance channels for red-green and luminance-modulated gratings: psychophysical data from human infants.
Spatial frequency tuned covariance channels for red-green and luminance-modulated gratings: psychophysical data from human infants.
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红绿和亮度调制光栅的空间频率调谐协方差通道：来自人类婴儿的心理物理数据。
DOI：
10.1016/s0042-6989(99)00188-1
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发表时间：
2000
期刊：
影响因子：
1.8
通讯作者：
Teller,DY
中科院分区：
文献类型：
--
作者：
Peterzell,DH;Chang,SK;Teller,DY
本研究探讨了婴幼儿对红绿刺激对比敏感度函数的空间频率调谐通道及其与亮度调制刺激对比敏感度函数的关系。使用行为（强迫选择偏好）技术和固定刺激。在实验1中，使用空间频率范围为0.27至1.53 c/ g的等光红绿光栅测量4个月和6个月大的婴儿的对比度阈值。在实验2中，在相同的低空间频率范围内，使用红绿光栅和亮度调制光栅测量4个月大的婴儿的对比度阈值。对个体差异进行协方差分析。实验1揭示了一个主要的协方差通道用于检测红绿光栅，第二个通道有助于检测所使用的最高空间频率。实验2显示有2 ~ 3个通道服务于颜色和亮度；但令人惊讶的是，这些通道在亮度和颜色刺激上并不是统计上可分离的。因此，颜色和亮度的协方差通道对成年人来说是独立的[Peterzell & Teller(2000)]。红绿和亮度调制光栅的空间频率调谐协方差通道：来自成人的心理物理数据。视觉研究，40,417-430]。这些数据表明，对于婴儿来说，色度和亮度调制刺激的检测阈值可能受到共同机制的限制。
This study concerns the spatial-frequency-tuned channels underlying infants’ contrast sensitivity functions (CSFs) for red–green chromatic stimuli, and their relationship to the channels underlying infants’ CSFs for luminance-modulated stimuli. Behavioral (forced-choice preferential-looking) techniques and stationary stimuli were used. In experiment 1, contrast thresholds were measured in 4- and 6-month-olds, using isoluminant red–green gratings with spatial frequencies ranging from 0.27 to 1.53 c/deg. In experiment 2, contrast thresholds were measured in 4-month-olds, using both red–green and luminance-modulated gratings in the same low spatial frequency range. Covariance analyses of individual differences were performed. Experiment 1 revealed one dominant covariance channel for the detection of red–green gratings, with a second channel contributing to detection of the highest spatial frequencies used. Experiment 2 revealed two to three channels serving color and luminance; but surprisingly these channels were not statistically separable for luminance versus chromatic stimuli. Thus, covariance channels for color and luminance that are independent for adults [Peterzell & Teller (2000). Spatial frequency tuned covariance channels for red–green and luminance-modulated gratings: psychophysical data from human adults. Vision Research, 40, 417–430] are apparently interdependent in infants. These data suggest that for infants, detection thresholds for chromatic and luminance-modulated stimuli may be limited by common mechanisms.