Laboratory of Brain and Cognition, NIMH/NIH, Bethesda, MD20892-1366, USA.
Cereb Cortex. 2017 Aug 1;27(8):4124-4138. doi: 10.1093/cercor/bhw224.
Human face recognition is often attributed to configural processing; namely, processing the spatial relationships among the features of a face. If configural processing depends on fine-grained spatial information, do visuospatial mechanisms within the dorsal visual pathway contribute to this process? We explored this question in human adults using functional magnetic resonance imaging and transcranial magnetic stimulation (TMS) in a same-different face detection task. Within localized, spatial-processing regions of the posterior parietal cortex, configural face differences led to significantly stronger activation compared to featural face differences, and the magnitude of this activation correlated with behavioral performance. In addition, detection of configural relative to featural face differences led to significantly stronger functional connectivity between the right FFA and the spatial processing regions of the dorsal stream, whereas detection of featural relative to configural face differences led to stronger functional connectivity between the right FFA and left FFA. Critically, TMS centered on these parietal regions impaired performance on configural but not featural face difference detections. We conclude that spatial mechanisms within the dorsal visual pathway contribute to the configural processing of facial features and, more broadly, that the dorsal stream may contribute to the veridical perception of faces.
人类面孔识别通常归因于整体加工;即,对面部特征的空间关系进行加工。如果整体加工依赖于精细的空间信息,那么背侧视觉通路中的视空间机制是否会对此过程做出贡献?我们在人类成年人中使用功能磁共振成像和经颅磁刺激(TMS),在相同-不同面孔检测任务中探索了这个问题。在后部顶叶皮层的局部空间处理区域中,与特征面孔差异相比,配置面孔差异导致明显更强的激活,并且这种激活的幅度与行为表现相关。此外,与特征面孔差异相比,检测到的配置面孔差异导致右侧 FFA 与背侧流的空间处理区域之间的功能连接明显增强,而与特征面孔差异相比,检测到的特征面孔差异导致右侧 FFA 与左侧 FFA 之间的功能连接增强。至关重要的是,集中在这些顶叶区域的 TMS 会损害配置面孔差异而不是特征面孔差异检测的性能。我们得出的结论是,背侧视觉通路中的空间机制有助于面部特征的整体加工,更广泛地说,背侧流可能有助于真实面孔的感知。
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