在腹部和背部路径中大规模组织的形状处理是可以与注意力分离的
Yael Goldstein-Marcusohn1, Rahaf Asaad1, Leen Asaad1
1Department of Psychology and the Centre for Vision Research, York University, 4700 Keele St, Toronto, ON M3J 1P3, Canada.
Cerebral cortex (New York, N.Y. : 1991)
|June 4, 2024
概括
大脑中的形状处理涉及腹部和背部视觉通路. 这项研究发现,无论注意力如何,形状选择性都会保持不变,这表明它部分独立于注意力机制.
科学领域:
- 神经科学是一个神经科学.
- 认知心理学 认知心理学
- 视觉感知 视觉感知 视觉感知
背景情况:
- 两种视觉通路模型将视觉处理分为腹部 (识别) 和背部 (视觉运动控制) 系统.
- 新出现的证据表明背部通路在形状处理和对象感知中的作用,但其与注意力的独立性仍在争论中.
研究的目的:
- 调查背部通路的形状处理灵敏度是否独立于注意力机制.
- 为了确定视觉路径中的形状选择性是否受到注意力焦点的调节.
主要方法:
- 进行了两个功能磁共振成像 (fMRI) 实验.
- 参与者观看了具有不同级别编码的新奇物体.
- 注意力被指向对象或其他图像特征 (例如背景颜色).
主要成果:
- 沿背部和腹部视觉路径的形状选择性组织无论注意力集中如何,都保持一致.
- 注意力影响了形状灵敏度,但这些影响在两个途径中都是可比的.
- 单变量和多变量分析证实了这些发现.
结论:
- 形状处理似乎至少可以部分地与注意力过程分离.
- 形状感知依赖于分布式的皮质区域网络,覆盖两个视觉通路.
- 这些发现挑战了严格的功能分离,并突出了视觉系统中的集成处理.
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