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在观察者的大脑中:双稳定运动揭示了V1中的中视尺度反调制
Alessandra Pizzuti1,2, Omer Faruk Gulban3,4, Laurentius Renzo Huber5
1Department of Cognitive Neuroscience, Faculty of Psychology and Neuroscience, Maastricht University, Maastricht, The Netherlands. a.pizzuti@maastrichtuniversity.nl.
Brain structure & function
|April 5, 2025
概括
这项研究表明,主要视觉区域 (V1) 在模两可的视觉运动感知过程中表现出减少的活动和特异性,这表明来自hMT+等更高大脑区域的反会影响早期视觉处理和意识体验.
科学领域:
- 神经科学是一个神经科学.
- 认知神经科学 认知神经科学
- 视觉感知 视觉感知 视觉感知
背景情况:
- 意识感知是神经科学的一个关键目标,视觉幻觉作为有价值的工具.
- 之前的研究将运动知觉映射到hMT+,但V1在可视化知觉中的作用仍然不清楚.
- 了解早期 (V1) 和高级 (hMT+) 视觉区域之间的相互作用,对于解释从不断刺激中获得的主观体验至关重要.
研究的目的:
- 通过使用超高场fMRI,研究V1和hMT+在双可视与物理运动感知期间的差异性层状调制.
- 阐明V1和hMT+在模两可的视觉刺激中的关系及其对意识知觉的贡献.
- 探索在可见感知过程中V1中反处理的作用.
主要方法:
- 在7特斯拉的层依赖功能磁共振成像 (fMRI).
- 对人类参与者呈现双稳定运动四重奏 (模两可) 和物理运动四重奏 (不模两可) 刺激.
- 在V1和hMT+中分析功能活动和时间动态.
主要成果:
- 在这两种条件下,hMT+活动与意识感知相关,没有观察到层状差异.
- 与物理条件相比,V1在模两可的条件下表现出功能响应和运动方向的特异性降低.
- 在模两可的感知过程中观察到V1和hMT+之间的时间合增加,这表明了反信号.
结论:
- 在模两可的刺激中,V1的反应减少和明显的层状形状表明hMT+的反发挥了重要作用.
- 增强的V1-hMT+时间合可以稳定运动的意识感知,尽管模两可的感官输入.
- 这些发现突出了早期和高级视觉区域在构建有意识的视觉体验中的动态相互作用.
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