Sugiura M, Kawashima R, Nakamura K, Okada K, Kato T, Nakamura A, Hatano K, Itoh K, Kojima S, Fukuda H
Department of Nuclear Medicine and Radiology, IDAC, Tohoku University, Sendai, 980-8575, Japan.
Neuroimage. 2000 Jan;11(1):36-48. doi: 10.1006/nimg.1999.0519.
Facial identity recognition has been studied mainly with explicit discrimination requirement and faces of social figures in previous human brain imaging studies. We performed a PET activation study with normal volunteers in facial identity recognition tasks using the subject's own face as visual stimulus. Three tasks were designed so that the activation of the visual representation of the face and the effect of sustained attention to the representation could be separately examined: a control-face recognition task (C), a passive own-face recognition task (no explicit discrimination was required) (P), and an active own-face recognition task (explicit discrimination was required) (A). Increased skin conductance responses during recognition of own face were seen in both task P and task A, suggesting the occurrence of psychophysiological changes during recognition of one's own face. The left fusiform gyrus, the right supramarginal gyrus, the left putamen, and the right hypothalamus were activated in tasks P and A compared with task C. The left fusiform gyrus and the right supramarginal gyrus are considered to be involved in the representation of one's own face. The activation in the right supramarginal gyrus may be associated with the representation of one's own face as a part of one's own body. The prefrontal cortices, the right anterior cingulate, the right presupplementary motor area, and the left insula were specifically activated during task A compared with tasks C and P, indicating that these regions may be involved in the sustained attention to the representation of one's own face.
在以往的人类脑成像研究中，面部身份识别主要是在有明确辨别要求的情况下，针对社会名人的面孔进行的。我们对正常志愿者进行了一项正电子发射断层扫描（PET）激活研究，在面部身份识别任务中使用受试者自己的面孔作为视觉刺激。设计了三个任务，以便能够分别检查面部视觉表征的激活情况以及对该表征持续关注的影响：一个对照面孔识别任务（C）、一个被动自我面孔识别任务（不需要明确辨别）（P）和一个主动自我面孔识别任务（需要明确辨别）（A）。在任务P和任务A中，识别自己面孔时皮肤电导反应均增加，这表明在识别自己面孔时会发生心理生理变化。与任务C相比，任务P和任务A中左侧梭状回、右侧缘上回、左侧壳核和右侧下丘脑被激活。左侧梭状回和右侧缘上回被认为与自己面孔的表征有关。右侧缘上回的激活可能与将自己的面孔作为自身身体的一部分的表征有关。与任务C和P相比，任务A期间前额叶皮质、右侧前扣带回、右侧辅助运动区和左侧岛叶被特异性激活，这表明这些区域可能参与对自己面孔表征的持续关注。
