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開催日 2014/9/13
時間 14:00 - 15:00
会場 Poster / Exhibition(Event Hall B)

サル視覚野における物体素材表現に視触覚経験が及ぼす効果: fMRI研究
Impact of visuo-tactile experience on neural representation of materials of objects in monkey visual cortex: an fMRI study

  • P3-180
  • 郷田 直一 / Naokazu Goda:1,2 横井 功 / Isao Yokoi:1,2 橘 篤導 / Atsumichi Tachibana:3 南本 敬史 / Takafumi Minamimoto:4 小松 英彦 / Hidehiko Komatsu:1,2 
  • 1:生理研生体情報感覚認知 / National Institute for Physiological Sciences, Aichi, Japan 2:総研大院生命科学生理 / SOKENDAI, Aichi, Japan 3:獨協医大医解剖(組織) / Dokkyo Medical University School of Medicine, Tochigi, Japan 4:放医研分子イメージング / Molecular Imaging Center, National Institute of Radiological Sciences, Chiba, Japan 

We can effortlessly know what an object is made of by seeing the object. Our recent studies suggest that such material perception involves ventral higher visual areas in humans and monkeys, and those areas represent not only visual properties (e.g., gloss) of the materials of the objects but also some tactile properties (e.g., hardness) of them. In the present study, we conducted an fMRI experiment in monkeys to investigate whether the neural representation of materials in the higher visual cortex is formed through learning of the visuo-tactile association observed in real-world materials. We scanned two awake macaque monkeys while viewing images of rods made of nine different materials before and after extensive visuo-tactile experiences of the nine materials (grasping the rods). Some of the materials (e.g., ceramic and fabric) were likely to be unfamiliar to the monkeys before the visuo-tactile experiences. Representational similarity analysis revealed that neural representation in early visual areas (typically V1) was stable before and after the visuo-tactile experiences. By contrast, neural representation in higher visual areas (typically posterior inferior temporal cortex) changed after the visuo-tactile experiences toward those reflecting the visuo-tactile properties assessed by human subjects. Our results suggest that neural representations in higher visual areas can be modified by visuo-tactile experiences and the neural representation of materials in those areas reflect visuo-tactile association established by the experiences.

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