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J Neurophysiol 82: 1610-1614, 1999;
0022-3077/99 $5.00
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The Journal of Neurophysiology Vol. 82 No. 3 September 1999, pp. 1610-1614
Copyright ©1999 by the American Physiological Society

RAPID COMMUNICATION

Activation of the Right Inferior Frontal Cortex During Assessment of Facial Emotion

Katsuki Nakamura,1 Ryuta Kawashima,2 Kengo Ito,3 Motoaki Sugiura,2 Takashi Kato,3 Akinori Nakamura,3 Kentaro Hatano,3 Sumiharu Nagumo,1 Kisou Kubota,4 Hiroshi Fukuda,2 and Shozo Kojima1

 1Department of Behavioral and Brain Sciences, Primate Research Institute, Kyoto University, Inuyama, 484-8506;  2Department of Nuclear Medicine and Radiology, IDAC, Tohoku University, Sendai, 980-8575;  3Department of Biofunctional Research, National Institute for Longevity Sciences, Obu, 474; and  4Department of Social and Information Sciences, Nihon Fukushi University, Handa, 475, Japan

Nakamura, Katsuki, Ryuta Kawashima, Kengo Ito, Motoaki Sugiura, Takashi Kato, Akinori Nakamura, Kentaro Hatano, Sumiharu Nagumo, Kisou Kubota, Hiroshi Fukuda, and Shozo Kojima. Activation of the Right Inferior Frontal Cortex During Assessment of Facial Emotion. J. Neurophysiol. 82: 1610-1614, 1999. We measured regional cerebral blood flow (rCBF) using positron emission tomography (PET) to determine which brain regions are involved in the assessment of facial emotion. We asked right-handed normal subjects to assess the signalers' emotional state based on facial gestures and to assess the facial attractiveness, as well as to discriminate the background color of the facial stimuli, and compared the activity produced by each condition. The right inferior frontal cortex showed significant activation during the assessment of facial emotion in comparison with the other two tests. The activated area was located within a triangular area of the inferior frontal cortex in the right cerebral hemisphere. These results, together with those of previous imaging and clinical studies, suggest that the right inferior frontal cortex processes emotional communicative signals that could be visual or auditory and that there is a hemispheric asymmetry in the inferior frontal cortex in relation to the processing of emotional communicative signals.




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