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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >The unseen color aftereffect of an unseen stimulus: Insight from blindsigltt into mechanisms of color afterimages
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The unseen color aftereffect of an unseen stimulus: Insight from blindsigltt into mechanisms of color afterimages

机译：看不见的刺激的看不见的色彩后效应：从盲目洞察到色彩残像的机理

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摘要

We show here that, in the absencc of a directgeniculostriate input in human subjects, causing loss of sight in the visual halffield contralateral to the damage, the pupil responds selectively to chromatic modulation toward the long-wavelength (red) region of the spectrum locus evenwhen the stimulus is isoluminant for both rods and cones and entirely restricted to the subjects'"blind" hemifields. We also show that other colors are less or wholly ineffective. Never- theless, red afterimages, generated by chromatic modulation toward the green region of the spectrum locus, also cause constrictions of the pupil even when green stimuli are them- selves completely ineffective in the blind hemifield. Moreover, human subjects with damage to or loss of V1 are typically completely unaware of the stimulus that generates the after- effect or of the aftereffect itself, both of which can be seen clearly in normal vision. The results show that pupillary responses can reveal the processing of color afterimages in the absence of primary visual cortex and in the absence of acknowledged awareness. This phenomenon is therefore a striking example of "blindsight" and makes possible the formulation of a model that predicts well the observed prop- erties of color afterimages.
机译：我们在这里显示出，在人类受试者中直接基因纤维素的输入缺席，导致与损害相反的视觉半场中的视力丧失，即使当光谱轨迹的长波长（红色）区域，瞳孔也选择性地响应色调制刺激对于棒和锥都是同质的，并且完全限于受试者的“盲”半场。我们还表明，其他颜色效果不佳或完全无效。但是，即使对盲半球而言，绿色刺激本身完全无效，通过对光谱轨迹的绿色区域进行色彩调制而产生的红色余像也会引起瞳孔收缩。此外，对V1造成损害或丧失的人类受试者通常完全不知道产生后效应的刺激或后效应本身，在正常视觉下都可以清楚地看到这两者。结果表明，在没有初级视觉皮层和没有公认的意识的情况下，瞳孔反应可以揭示彩色余像的处理。因此，这种现象是“视力不佳”的一个突出例子，它使得建立一个可以很好地预测观察到的彩色余像特性的模型成为可能。

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