语境反信号在人类V1中的空间精度
Lucy S Petro1,2, Fraser W Smith3, Clement Abbatecola1,2
1Centre for Cognitive Neuroimaging, School of Psychology and Neuroscience, College of Medical, Veterinary and Life Sciences, University of Glasgow, Glasgow G12 8QB, UK.
Biology
|July 29, 2023
概括
皮层反信号在主要视觉皮层 (V1) 中调节视觉处理,精度约为4度. 这些反信号对于理解全球场景背景至关重要,无论直接视觉输入是否存在或不存在,都以类似的方式运行.
科学领域:
- 神经科学是一个神经科学.
- 认知科学 认知科学
- 视觉感知 视觉感知 视觉感知
背景情况:
- 初级视觉皮层 (V1) 中的神经元通过皮层反将局部视觉信息与来自更高视觉区域的全球背景进行整合.
- 了解这种上下文调制的空间精度是阐明反在感知中的作用的关键.
研究的目的:
- 在自然场景处理过程中调查 V1 的上下文反输入的空间精度.
- 通过分析它们在空间位移上的概括来确定反信号如何为感知计算做出贡献.
主要方法:
- 利用人类功能磁共振成像 (fMRI) 来测量V1.1.中的大脑活动模式.
- 采用多变量模式分析 (MVPA) 交叉分类来评估跨空间移位图像的活动模式的概括性.
- 直接刺激的V1地区的活动与仅收到非feedforward输入的地区的活动进行了比较.
主要成果:
- 皮层反信号中的fMRI活动模式预测了V1中的特定场景特征,空间精度约为4度.
- 刺激和非刺激的V1区域都显示了高达4度的信息概括,表明了一致的反.
- 语境反信号的运作方式类似,不管有没有直接的前输入.
结论:
- 从外层区域到V1的皮层反提供了具有显著空间精度的全球场景信息 (大约为1. 4 度). 这就是为什么.
- 这些反机制对于感知计算至关重要,包括在自然场景中对特征界限的层次表示.
- 这些发现强调了反在塑造视觉感知方面的重要性,超越了局部感官输入.
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