サル下側頭葉皮質における顔視覚像反応領域の「顔」及び「顔の部品」に対する視覚応答:PETによる検討

尾上浩隆、塚田秀夫、藤田一郎

23回日本神経科学大会

10回日本神経回路学会大会合同大会プログラム・抄録集p.109

200094日(月)〜6日(水)横浜みなとみらい21 パシフィコ横浜

我々はこれまでに、positron emission tomography(PET)法を用い、顔の視覚刺激に対するサルの脳の機能マッピングを行い、顔の視覚情報処理に下側頭葉皮質の前中側頭溝外側部の前部に位置する領域が深く関わっていることを見いだした。今回、「顔」及び「顔の部品」に対する視覚応答を比較し、その特性について検討を加えた。実験では2頭の雄のアカゲザルの成獣を用い、CRT画面上の小さなスポットに対する注視課題遂行中に、様々なサルの顔や顔の部品の画像を提示しPETスキャンを行った。その結果、TE野の前中側頭溝外側部の前部領域は「目だけ」、「口だけ」、「目のない顔」のそれぞれの画像に対して、「顔」に対する反応と同程度の強い活動を示すことが明らかになった。このことから、TE野の前中側頭溝外側部の前部領域は顔の全体認識だけではなく、もしくはそれよりもむしろ顔の部分的な特徴認識に強く関与していることが示唆された。


P-119 Responses to face and facial parts of the face-processing area in the inferior temporal cortex of macaque monkeys: a PET study

Neurosci. Res. Suppl. 24: S74

Hirotaka Onoe l,4, Hideo Tsukada 2. Ichiro Fujita 3,4
1Dept. Psychol.. Tokyo Metropol. Inst. Neurosci., Tokyo, Japan, 2Central Res. Lab., Hamamatsu Photonics, Shizuoka. Japan, 3 Dept. Cogni. Neurosci.. Crad. Sch. Eng. Sci., Osaka Univ.. Osaka Japan, 4CREST, JST. Osaka Japan

Recently, we found a region in area TE of inferior temporal cortex which was strongly activated during passive viewing of face images by applying a PET imaging technique to behaving macaque monkeys. This region was localized in the anterior part of the TE Iatenl to the anterior middle temporal sulcus, and was more strongly activated by faces than by nonface objects. In this study, we tuther characterized the stimulus-selectivity of this region by presenting facial parts as visual stimuli. A set of pictures of complete faces of a monkey, 3 sets of pictures of either eyes, mouths, or faces with masked eyes, and a set of scrambled faces were presented in blocks, while monkeys (Macaca mulatta) fixated on a spot at the center of CRT display. A stronger increase in regional cerebral blood flow evoked by complete faces than that of scrambled faces was observed only in the region in area TE, which conesponds to the region we previously reported. All of the sets of facial parts also significantly activated this region, and there was no significant difference in the magnitude of responses among them. Results suggest that the face-processing region in area TE contains neurons which respond to facial parts. It may play a role in the perception of local features of faces rather than or in addition to a global sight of faces. (Supported by CREST)


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