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Plastic representation of face view in human visual system

机译：人类视觉系统中人脸视图的可塑性表示

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Previous brain imaging studies have demonstrated that perceptual learning could enhance the representation of visual features in human early visual cortex. In this study, we used functional magnetic resonance imaging (fMRI) to investigate how perceptual learning could change the representation of face view in human visual system. We trained subjects to discriminate face orientations around a face side view (e.g. 30 deg) over eight days, which resulted in a dramatic improvement in sensitivity to face view orientation. This improved sensitivity was highly specific to the trained face side view. Before and after training, subjects were scanned to measure their brain responses (BOLD signal) to both the trained face view and untrained face views. We analyzed BOLD signals from cortical areas throughout the visual hierarchy, including early and middle-level visual areas (V1, V2, V3 and V4), occipital face area (OFA), superior temporal sulcus (STS) and fusiform face area (FFA). We found that, relative to untrained face views, BOLD signals in FFA and STS (but not other areas) to the trained face view significantly increased after the training on face view orientation discrimination, which was parallel to the psychophysical result. Our data suggest that the enhanced representation of a face view in higher visual areas could subserve our perceptual ability to discriminate face orientations around the face view.
机译：先前的脑成像研究表明，知觉学习可以增强人类早期视觉皮层中视觉特征的表示。在这项研究中，我们使用功能磁共振成像（fMRI）来研究知觉学习如何改变人眼视觉系统中人脸视图的表示。我们训练对象在八天的时间里区分面部侧视图（例如30度）周围的面部朝向，从而极大地提高了对面部朝向的敏感度。这种提高的灵敏度对于训练后的面部侧视图是高度特定的。在训练之前和之后，对受试者进行扫描以测量他们对训练后的面部视图和未训练的面部视图的大脑反应（BOLD信号）。我们分析了整个视觉层次中来自皮质区域的BOLD信号，包括早期和中层视觉区域（V1，V2，V3和V4），枕面部区域（OFA），颞上沟（STS）和梭状面部区域（FFA） 。我们发现，相对于未经训练的面部视图，经过面部视图方位辨别训练后，FFA和STS（而非其他区域）中向受训练的面部视图的BOLD信号显着增加，这与心理生理结果平行。我们的数据表明，在较高的视觉区域中增强人脸视图的表示方式可以使我们有能力区分人脸视图周围的人脸取向。

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