Activation of the right inferior frontal cortex during assessment of facial emotion

Katsuki Nakamura, Ryuta Kawashima, Kengo Ito, Motoaki Sugiura, Takashi Kato, Akinori Nakamura, Kentaro Hatano, Sumiharu Nagumo, Kisou Kubota, Hiroshi Fukuda, Shozo Kojima

Research output: Contribution to journalArticlepeer-review

237 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)1610-1614
Number of pages5
JournalJournal of Neurophysiology
Issue number3
Publication statusPublished - 1999


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