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首页> 美国卫生研究院文献>The Journal of Neuroscience >Human V4 Activity Patterns Predict Behavioral Performance in Imagery of Object Color
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Human V4 Activity Patterns Predict Behavioral Performance in Imagery of Object Color

机译：人类V4活动模式预测对象颜色图像中的行为表现

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摘要

Color is special among basic visual features in that it can form a defining part of objects that are engrained in our memory. Whereas most neuroimaging research on human color vision has focused on responses related to external stimulation, the present study investigated how sensory-driven color vision is linked to subjective color perception induced by object imagery. We recorded fMRI activity in male and female volunteers during viewing of abstract color stimuli that were red, green, or yellow in half of the runs. In the other half we asked them to produce mental images of colored, meaningful objects (such as tomato, grapes, banana) corresponding to the same three color categories. Although physically presented color could be decoded from all retinotopically mapped visual areas, only hV4 allowed predicting colors of imagined objects when classifiers were trained on responses to physical colors. Importantly, only neural signal in hV4 was predictive of behavioral performance in the color judgment task on a trial-by-trial basis. The commonality between neural representations of sensory-driven and imagined object color and the behavioral link to neural representations in hV4 identifies area hV4 as a perceptual hub linking externally triggered color vision with color in self-generated object imagery.>SIGNIFICANCE STATEMENT Humans experience color not only when visually exploring the outside world, but also in the absence of visual input, for example when remembering, dreaming, and during imagery. It is not known where neural codes for sensory-driven and internally generated hue converge. In the current study we evoked matching subjective color percepts, one driven by physically presented color stimuli, the other by internally generated color imagery. This allowed us to identify area hV4 as the only site where neural codes of corresponding subjective color perception converged regardless of its origin. Color codes in hV4 also predicted behavioral performance in an imagery task, suggesting it forms a perceptual hub for color perception.
机译：颜色是基本视觉功能中的一种特殊之处，因为它可以构成我们记忆中根深蒂固的对象的定义部分。尽管大多数关于人类彩色视觉的神经影像学研究都集中在与外部刺激有关的反应上，但本研究调查了感官驱动的彩色视觉如何与物体图像诱发的主观色彩感知相关联。我们在观看一半运行的红色，绿色或黄色抽象颜色刺激期间，在男性和女性志愿者中记录了fMRI活动。在另一半中，我们要求他们产生与相同的三种颜色类别相对应的有色有意义对象（例如番茄，葡萄，香蕉）的心理图像。尽管可以从所有视网膜视点映射的视觉区域解码出物理呈现的颜色，但是当分类器对物理颜色的响应进行训练时，只有hV4允许预测想象对象的颜色。重要的是，只有hV4中的神经信号才能在逐个试验的基础上预测颜色判断任务中的行为表现。 hV4中感觉驱动的和想象的对象颜色的神经表示以及与神经表示的行为链接之间的共性将区域hV4识别为将外部触发的颜色视觉与自身生成的对象图像中的颜色链接起来的感知枢纽。>意义声明人类不仅在视觉上探索外部世界时会体验色彩，而且在没有视觉输入的情况下（例如，记住，做梦以及在成像时）也会体验色彩。尚不知道在哪里，由感觉驱动和内部生成的色相的神经代码在哪里收敛。在当前的研究中，我们提出了匹配的主观色彩感知，一种是由物理呈现的色彩刺激驱动的，另一种是由内部生成的彩色图像驱动的。这使我们能够将hV4区域识别为唯一的站点，在该站点中，相应的主观颜色感知的神经代码会聚，无论其来源如何。 hV4中的颜色代码还预测了成像任务中的行为表现，表明它形成了颜色感知的感知枢纽。

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