定向调整的正常化如何在视野中传播?
Michaela Klímová1,2,3, Ilona M Bloem4, Sam Ling1,2
1Department of Psychological and Brain Sciences, Boston University, Boston, Massachusetts, United States.
Journal of neurophysiology
|January 8, 2025
概括
增益控制机制调节视觉皮层的反应. 这项研究发现,当刺激是直线的时,定向调整的环境抑制更强,影响早期视觉区域的神经反应.
科学领域:
- 神经科学是一个神经科学.
- 视觉感知 视觉感知 视觉感知
- 计算神经科学是一种神经科学.
背景情况:
- 视皮质反应依赖于增强控制,包括包围抑制.
- 抑制强度随着刺激的特征而变化,例如方向相似性.
- 定向调节抑制对对比反应的影响还没有得到充分研究.
研究的目的:
- 研究定向调节抑制在早期视觉皮层中调节对比响应函数 (CRF) 的作用.
- 确定特征相似性,特别是对线性与直角性的相似性,如何影响抑制强度.
- 为了检查这种调节抑制在视野中的空间传播.
主要方法:
- 使用功能磁共振成像 (fMRI) 测量视觉区域V1-V3.3中的大脑活动.
- 给观察者提供了中心周围格子,其中中心和周围的方向是对直线或直角的.
- 在一系列中心刺激对比度中测量了人口对比反应函数 (CRF).
主要成果:
- 当周围格子与正交格子相比与中心格子对齐时,观察到更强的抑制.
- 这种定向调节的抑制导致了人口CRF的显著转变.
- CRF转移的幅度取决于voxel的空间偏好,主要影响中心周围边界附近的voxel.
结论:
- 导向相似性显著影响早期视觉皮层中围绕抑制的强度.
- 调节抑制主要影响神经群体,在中心周围边界处具有受体场的神经群体.
- 这些发现阐明了特征调节的增益控制机制,塑造了视觉处理和感知.
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