Chromatic contrast in luminance-defined images affects performance and neural activity during a shape classification task.
Chromatic contrast in luminance-defined images affects performance and neural activity during a shape classification task.
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亮度定义图像中的色彩对比度会影响形状分类任务期间的性能和神经活动。
DOI：
10.1167/15.15.21
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发表时间：
2015
影响因子：
1.8
通讯作者：
Jennings BJ
中科院分区：
文献类型：
--
作者：
Jennings BJ
物体识别的模型通常强调亮度定义的形状的重要性。然而，颜色信号如何与亮度信号联合收割机组合以影响与对象相关的形式处理，这仍然没有完全理解。这项脑电图研究旨在通过评估颜色对比度对形状相关加工时间进程的影响来研究颜色对比度的贡献。与会者分类对象的形状，非对象的形状，和补丁的伪随机分散的Gabor的Gaborized图像。刺激激发（a）单独的亮度（L+ M）通道，（B）亮度和LM通道，或（c）亮度、LM和S-（L+ M）通道，并以平均辨别阈值或该平均阈值的两倍呈现。正如预期的那样，分类准确性在阈值处相当，事件相关电位（ERP）的早期感知第一负（N1）分量的属性也是如此。差异出现在阈上：由通道的完整组合定义的对象与最差的性能和最低的N1振幅相关。形状敏感性并不总是在N1中观察到，但在认知ERP成分的晚期正电位（LPP）中更为明显。N1和LPP都受到图像中对比度的量和类型的影响。虽然亮度和LM对比度的效果是相似的，影响ERP选择性在N1和LPP期间，S-（L+ M）对比度引起持续的振幅偏移。我们的研究结果表明，第一次使用的行为以及早期和晚期的电生理效应的组合，形状分类是由彩色和亮度的图像内容。
Models of object recognition generally emphasize the importance of luminance-defined shape. However, it is still not fully understood how color signals combine with luminance signals to affect object-related form processing. This electroencephalographic study aimed to examine the contribution of chromatic contrast by assessing its effects on the time course of shape-related processing. Participants classified Gaborized images of object shapes, nonobject shapes, and patches of pseudorandomly scattered Gabors. Stimuli excited (a) the luminance (L+ M) channel alone,(b) luminance and LM channels, or (c) luminance, LM, and S-(L+ M) channels and were presented either at mean discrimination threshold or at twice this mean threshold. As expected, classification accuracy was comparable at threshold, as were the attributes of the early, perceptual first negative (N1) component of the event-related potential (ERP). Differences emerged at suprathreshold: Objects defined by the full combination of channels were associated with the poorest performance and the lowest N1 amplitude. Shape sensitivity was not consistently observed in the N1 but was more evident in the late positive potential (LPP), a cognitive ERP component. Both the N1 and the LPP were affected by the amount and type of contrast in the image. While the effects of luminance and LM contrast were similar, affecting the ERP selectively during the N1 and LPP period, S-(L+ M) contrast elicited a sustained shift in amplitude. Our results demonstrate, for the first time using a combination of behavioral as well as early and late electrophysiological effects, that shape classification is determined by both the chromatic and the luminance content of the image.
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