中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
猕猴 V4 区生物运动特征信息加工

文献类型:学位论文

Author刘精璇
Issued Date2022-06
Subtype硕士
Degree Grantor中国科学院大学
Place of Degree Grantor中国科学院心理研究所
Other responsible张弢
Keyword生物运动 运动模式 形状识别 V4 猕猴
Degree Name理学硕士
Degree Discipline基础心理学
Alternative TitleFeature information processing of biological movement in rhesus monkey V4 area
AbstractIt is the inherent stability ability of human beings, including other creatures, to make a quick and effective judgment on the identity, gender and intention of an organism by using its own movement information, and it plays an important role in individual survival and social interaction. However, in the past, the extensive research on biological movement focused more on behavior and psychophysics. With the development of technology in recent ten years, the evidence from the fields of brain functional imaging, neural regulation and neuroelectrophysiology shows that the dorsal pathway of the visual system, especially the higher cortex, has made a great contribution to the recognition of biological movement, but the relationship between ventral pathway and information processing of biological movement is still confined to the study of brain injury cases. Little is known about whether the cortex of ventral pathway is involved in encoding biological movement information. This study is devoted to exploring the neurophysiological mechanism of biological movement information processing, and puts forward the hypothesis that V4, the intermediate cortex of ventral pathway, may be involved in the characteristic information processing of biological movement. In this study, in view of the high similarity between rhesus monkeys and human brains in functional anatomy, we adopted the extracellular recording technology of conscious monkey nerve electrophysiology, and implanted electrode arrays in the V4 brain area, an important part of ventral pathway, to explore the responses of neurons to biological motor stimulation, linear optical flow stimulation and nonlinear optical flow stimulation. Starting with the shape, inversion and walking direction of biological motion stimulus, this paper aims to find out the contribution of V4 brain region in the extraction of biological motion feature information. The results show that: 1) There are a large number of neurons in the V4 brain area that can be activated by scattered movement stimulation, and the selective response to radial light flow is significantly stronger than that of rotating light flow, while expansion movement can induce stronger firing than contraction movement; 2) Neurons in V4 brain area have significantly different responses on average distribution rate to PLD stimulation (point-light displays) with three characteristics: inversion (upright vs inverted), form (intact vs scattered) and direction of walking (left vs right), which is obviously different from the neural mechanism of dynamic encoding of biological motion information by higher cortex in dorsal visual pathway. These results indicate that there are a large number of neurons in V4 area that are sensitive to scattered movement patterns, and they can encode biological movement characteristic information through differential average distribution frequency, which provides direct evidence for finding out the neural mechanism of biological movement information processing in the key brain areas of ventral visual pathway.
English Abstract利用生物体本身的运动信息,来对其身份、性别、意图等进行快速而有效的判断是人类以及其他生物与生俱来的稳定能力,并在个体的生存和社交方面发挥着重要作用。不过,以往对生物运动的广泛研究更多集中于行为学、心理物理学。近十多年随着技术的发展,来自脑功能成像、神经调控、神经电生理等领域的证据表明视觉系统背侧通路,尤其是高级皮层在生物运动识别中有着较大贡献,但对腹侧通路与生物运动信息加工的关系依旧停在脑损伤病例的研究上。腹侧通路的各皮层是否参与编码生物运动信息所知甚少。本研究致力于探究生物运动信息加工过程的神经电生理学机制,提出腹侧通路的中级皮层区 V4 区可能参与生物运动特征信息编码过程的假设。 在本研究中,鉴于猕猴与人类大脑在功能解剖上的高度相似性,我们采用清醒猴神经电生理胞外记录技术,对腹侧通路的重要组成部分 V4 脑区置入电极阵列,探究神经元对生物运动刺激、线性光流刺激以及非线性光流刺激的反应情况。从生物运动刺激的形状、倒置和行走方向三个特征信息入手,以期探明 V4 脑区在生物运动特征信息提取中的贡献。结果发现:1)V4 脑区存在大量神经元可以被散点运动刺激激活,且对径向光流的选择性反应显著强于旋转光流,而扩张运动比收缩运动能诱发更强的发放; 2)V4 脑区神经元对倒置(正立 vs 倒立)、形状(完整 vs 打散)、行进方向(向左 vs 向右)三个特征的 PLD 刺激(point-light displays,PLD)均存在平均发放率上的显著差异化反应,这与背侧视觉通路中高级皮层对生物运动信息动态编码的神经机制明显不同。这些结果表明 V4 区存在大量神经元对散点运动模式敏感,且可通过差异化平均发放频率编码生物运动特征信息,为探明生物运动信息在腹侧视觉通路关键脑区加工的神经机制提供了直接证据。
Language中文
源URL[http://ir.psych.ac.cn/handle/311026/43127]  
Collection心理研究所_认知与发展心理学研究室
Recommended Citation
GB/T 7714
刘精璇. 猕猴 V4 区生物运动特征信息加工[D]. 中国科学院心理研究所. 中国科学院大学. 2022.

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来源:心理研究所

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