对视觉特征的准备性关注在全球范围内蔓延.
Melisa Menceloglu1, Søren K Andersen2, Taosheng Liu1
1Department of Psychology, Michigan State University.
概括
即使在刺激出现之前,对视觉特征的准备性注意力也在全球范围内传播,支持其在引导视觉搜索中的作用. 这种基于特征的关注的全球传播表明了统一的自上而下的控制机制.
科学领域:
- 认知神经科学 认知神经科学
- 视觉注意力 视觉注意力
- 神经科学是一个神经科学.
背景情况:
- 基于特征的注意力增强了神经对相关和不相关刺激的反应,共享了所关注的特征.
- 假设这种全局促进指导视觉搜索,但主要是在主动刺激选择期间观察到的.
- 准备性关注在引导搜索的全球特征传播中发挥的作用仍然没有经验证实.
研究的目的:
- 调查是否基于特征的全局注意力在预备性注意力期间扩散,在刺激呈现之前.
- 为全球特征分布在指导视觉搜索中的作用提供实证支持.
- 探索基于特征的注意力的上下控制信号的共同起源.
主要方法:
- 20名观察员记录了脑电图 (EEG),观察着闪的蓝色和色点场.
- 利用了立即开始和延迟开始的条件,在这些条件下,随访的刺激同时出现或延迟后出现.
- 分析了特定频率的视觉唤起反应,以评估本地和全球注意力效应.
主要成果:
- 在立即开始的条件下确认了典型的本地和全球基于特征的注意力效应.
- 在延迟发病的条件下,在准备期观察到显著的整体注意力效应.
- 发现了局部/全球效应和准备性注意力/积极选择之间的正相关性.
结论:
- 对特征的准备性注意力在全球范围内运行,即使没有物理刺激,也支持其在指导视觉搜索中的作用.
- 这些发现表明,统一的自上而下的控制信号是准备和主动选择过程的基础.
- 这项研究弥合了基于特征的注意力机制及其指导视觉搜索的功能之间的差距.
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