How the brain learns to see objects and faces in an impoverished context
How the brain learns to see objects and faces in an impoverished context
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DOI：
10.1038/39309
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发表时间：
1997-10-09
期刊：
影响因子：
64.8
通讯作者：
Friston, KJ
中科院分区：
文献类型：
--
作者：
Dolan, RJ;Fink, GR;Friston, KJ
物体或脸部的退化图像在第一次看到时显得毫无意义，但在查看同一图像的未退化版本后很容易被识别(1)。这种快速感知学习形式促进感知的神经机制尚不清楚。心理学理论表明，涉及处理刺激属性、空间注意力和特征绑定（2）的系统，以及涉及视觉意象（3）的系统。在这里，我们通过使用功能神经成像来测量在暴露于相应的未降级版本之前和之后的降级图像期间的大脑活动，研究这种快速感知学习在人脑中的表达位置和方式（图1）。面部或物体的感知学习增强了已知分别参与面部和物体识别的下颞区的活动（4-6）。此外，面部和物体学习都会导致内侧和外侧顶叶区域的活动增加，这些区域与注意力（7）和视觉意象（8）有关。我们观察到，当且仅当感知面部时，颞面部区域和内侧顶叶皮层之间存在很强的耦合，这表明感知学习涉及涉及面部识别的区域与涉及空间注意、特征绑定和记忆回忆的区域之间的直接相互作用。
A degraded image of an object or face, which appears meaningless when seen for the first time, is easily recognizable after viewing an undegraded version of the same image(1), The neural mechanisms by which this form of rapid perceptual learning facilitates perception are not well understood. Psychological theory suggests the involvement of systems for processing stimulus attributes, spatial attention and feature binding(2), as well as those involved in visual imagery(3). Here we investigate where and how this rapid perceptual learning is expressed in the human brain by using functional neuroimaging to measure brain activity during exposure to degraded images before and after exposure to the corresponding undegraded versions (Fig. 1), Perceptual learning of faces or objects enhanced the activity of inferior temporal regions known to be involved in face and object recognition respectively(4-6). In addition, both face and object learning led to increased activity in medial and lateral parietal regions that have been implicated in attention(7) and visual imagery(8). We observed a strong coupling between the temporal face area and the medial parietal cortex when, and only when, faces were perceived, This suggests that perceptual learning involves direct interactions between areas involved in face recognition and those involved in spatial attention, feature binding and memory recall.