第32回日本神経科学大会

会期:2009.9.16-18
会場: 名古屋国際会議場

側頭葉皮質および扁桃体において刺激画像の大きさが顔反応性細胞の空間周波数チューニングに与える効果
Effects of stimulus size on spatial frequency tuning of face-responsive neurons in the temporal visual cortex and the amygdala
演題番号 : O1-J6-2 一般口演 発表日:2009.9.16

稲垣 未来男(Mikio Inagaki):1 藤田 一郎(Ichiro Fujita):1 

1:大阪大院・生命機能・認知脳科学(Lab Cogn Neurosci, Grad Sch Frontier Biosciences, Osaka Univ, Osaka, Japan)


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Psychophysical performance of face discrimination in human subjects depends on spatial frequencies (SFs) of face images. Changes in image size, which accompany changes in retina-based SFs (cycles/deg), only minimally influence face discrimination performance. Face discrimination depends more on relative SFs normalized by image size or image-based SFs (cycles/image). We reasoned therefore that if neurons in a brain area contribute to face discrimination, they should be tuned to image-based SFs rather than retina-based SFs. Here, we examined whether face-responsive neurons in the temporal visual cortex and the amygdala of monkeys are tuned to image-based SFs or retina-based SFs by assessing effects of image size on SF tuning. Most neurons in the temporal cortex and only a few neurons in the amygdala were tuned to image-based SFs, demonstrating a difference in face representations between the two areas. Properties of temporal cortex neurons are more consistent with face discrimination abilities than are those of amygdala neurons.