Bindemann Markus, Burton A Mike, Leuthold Hartmut, Schweinberger Stefan R
Department of Psychology, University of Glasgow, Glasgow, UK.
Psychophysiology. 2008 Jul;45(4):535-44. doi: 10.1111/j.1469-8986.2008.00663.x. Epub 2008 May 20.
The N250r is an event-related potential that has been related to activation of image-independent representations of familiar faces during recognition. However, N250r also shows a degree of image specificity, with reduced activation across repetitions of different images of the same face compared to repetitions across the same image, suggesting a component that codes the visual overlap between two face images. This study investigated whether N250r is equally attenuated when horizontally or vertically stretched faces prime an unstretched image of the same face. The results confirm that N250r is larger across repetitions of the same face image than across different images of the same face. Despite this, N250r was equivalent for priming by the same face image and priming from stretched onto unstretched faces. This finding demonstrates that N250r does not simply reflect the superficial visual overlap between two face images and supports the notion that it is related to person recognition.
N250r是一种事件相关电位，与识别过程中熟悉面孔的独立于图像的表征激活有关。然而，N250r也表现出一定程度的图像特异性，与同一图像的重复呈现相比，同一面孔不同图像的重复呈现会导致激活程度降低，这表明存在一个对两张面孔图像之间视觉重叠进行编码的成分。本研究调查了在水平或垂直拉伸的面孔启动同一未拉伸面孔图像时，N250r是否同样减弱。结果证实，同一面孔图像的重复呈现比同一面孔不同图像的重复呈现时N250r更大。尽管如此，同一面孔图像启动和从拉伸面孔到未拉伸面孔的启动所引发的N250r是等效的。这一发现表明，N250r并非简单地反映两张面孔图像之间的表面视觉重叠，并支持了它与人物识别相关的观点。
