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从视觉皮层活动对注意力场的动态估计

Ilona M Bloem^1,2, Leah Bakst¹, Joseph T McGuire¹

¹Department of Psychological & Brain Sciences, Boston University, Boston, USA.

bioRxiv : the preprint server for biology

|September 24, 2024

概括

这项研究揭示了大脑如何根据任务需求调整空间注意力的大小. 使用fMRI,研究人员发现注意力场随着更广泛的线索而扩大,增强视觉处理.

科学领域:

认知神经科学认知神经科学
神经成像是一种神经成像.
视觉注意力视觉注意力

背景情况:

空间注意力通过增强视野皮层表征来增强视觉感知.
空间注意力的位置已经得到了很好的研究,但其传播的动态范围仍然不太了解.
了解注意力场的大小对于解释复杂环境中的适应性知觉至关重要.

研究的目的:

动态估计人类隐藏空间注意力的位置和传播.
调查行为需求如何影响注意力聚光灯的大小.
模拟视野皮层活动,推断注意力分配的动态.

主要方法:

在人类中使用功能磁共振成像 (fMRI) 开发了一种新型范式.
参与者执行了一项需要隐蔽视觉注意力的任务,该任务是在不同宽度的线索环内完成的.
分析了视网膜视觉区域 (V1-V3) 的血液氧气水平依赖 (BOLD) 活动,以建模注意力调制.

主要成果:

注意部署在相应的视网膜类视觉区域增加了BOLD活动.
该模型成功地恢复了注意力的指针位置.
观察到注意力增强的扩大与更广泛的注意力线索,表明灵活的聚光灯大小.

结论:

可模拟视野皮质活动以动态评估空间注意力的传播.
注意聚光灯的尺寸适应地调整到被标记区域的宽度,反映行为需求.
这种方法提供了关于空间注意力和不确定性背后的神经机制的见解.

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