Neural correlates of shape perception : neuroimaging studies.

形状感知的神经相关性：神经影像学研究。

• 批准号: 15330155
• 负责人: EJIMA Yoshimichi
• 金额: $ 8.45万
• 依托单位: Kyoto Institute of Technology (2004-2005)Kyoto University (2003)
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-15330155/
• 关键词: fMRI; contextual effect; chromatic induction; amodal completion; masking; vision; f MRI; 脳イメージング; 視覚領野; 立体視; 輪郭線知覚; 対比; 形体知覚; VEP; 知覚的マスキング; 視野表象; 対称性

The present study aimed to elucidate the neural correlates to the perceptual contextual effects by using neuroimaging technique. We examined the brain activities in the retinotopic areas of the visual cortex during subjects perceived the various stimuli evoking contextual effects and the functional relationship among these areas in the processing of the visual stimuli.We have carried out fMRI measurements for the visual phenomena of the contextual effects such as chromatic induction effect, masking effect and amodal completion. We identified the retinotopic areas on the basis of the fMRI measurement using phase-encoding stimuli. The brain activities were measured during subject perceived the chromatic induction, masking, and amodal completion and the results were analyzed and compared among the retinotopic areas. The results showed that there was difference in the spatio-temporal characteristics of the brain activities between the early and higher-order visual cortical areas. In general, the spatial extent of the contextual effect is characterized as local for early processes such as V1, V2 and V3. On the other hand, the spatial extent of the contextual effect is characterized as global for higher-stage such as V4. Psychophysical measurement of the chromatic induction and masking effect showed that the differential effects of the visual context correspond to the local and global processing of the visual information.

本研究旨在利用神经影像技术阐明知觉语境效应的神经相关机制。本研究探讨了被试在感知各种引起情境效应的刺激时视皮层视网膜视区的脑活动及其在视觉刺激加工过程中的功能关系，并对情境效应的视觉现象如色彩诱导效应、掩蔽效应和非模态完成进行了fMRI测量。我们确定的视网膜视区的基础上的功能磁共振成像测量使用相位编码的刺激。测量被试在感知色诱导、掩蔽和非模态完成时的脑活动，并对结果进行视网膜视区分析和比较。结果表明，视觉皮层早期和高级区域的脑活动时空特征存在差异。一般来说，对于V1、V2和V3等早期加工，语境效应的空间范围具有局部性。另一方面，语境效应的空间范围在更高阶段（如V4）表现为全局性。对色彩诱导和掩蔽效应的心理物理测量表明，视觉环境的差异效应对应于视觉信息的局部和整体加工。

项目成果

等輝度色刺激を用いた視覚マスキング効果の解析

使用等亮度颜色刺激的视觉掩蔽效应分析

• 发表时间: 2005
• 期刊: 電子情報通信学会技術報告 HIP2005-14
• 作者: 山城;前田;高田;山本;江島
• 通讯作者: 江島

Analysis of visual masking effect induced by isoluminant chromatic stimuli.

等亮度色刺激引起的视觉掩蔽效应分析。

• 期刊: The Institute of Electronics, Information and Communication Engineers Technical Report HIP2005-14
• 作者: H.Yamashiro;K.Maeda;M.Takada;H.Yamamoto;Y.Ejima
• 通讯作者: Y.Ejima

脳機能イメージングによるヒト視覚野のレチノトピー構造と形態の全一性との関係解析

利用功能性脑成像分析人类视觉皮层视网膜结构与形态完整性之间的关系

• 发表时间: 2004
• 期刊: 電子情報通信学会技術報告 HIP2003-127 103・743
• 作者: 番;福永;中越;山本;田中;恵比須;梅田;江島
• 通讯作者: 江島

G.J.van Tonder, Y.Ejima: "Computation of Shape Symmetries within the maximal Disk Paradigm"IEEE Transaction on Systems, Man, and Cybernetics-Part B : Cybernetics. 33・3. 535-541 (2003)

G.J.van Tonder，Y.Ejima：“最大磁盘范式内的形状对称性计算”IEEE Transaction on Systems, Man, and Cyber​​netics-Part B：Cyber​​netics（控制论）。

ハルト・バン・トンダー, マイケル・ライオンズ, 江島義道: "龍安寺の石庭を科学する。"電子情報通信学会誌. 86・10. 742-746 (2003)

Hart van Tonder、Michael Lyons、Yoshimichi Ejima：“龙安寺岩石花园的科学”。电子、信息和通信工程师学会杂志 86・10（2003 年）。