与瞳孔连接的兴奋调节了皮质中刺激表现的精度.
Laura S Geurts1, Sam Ling2,3, Janneke F M Jehee4
1Donders Institute for Brain, Cognition, and Behaviour, Radboud University, Nijmegen 6525 EN, the Netherlands.
概括
即使在持续的刺激下,神经活动也会变化. 这项研究将神经变异性与通过瞳孔大小测量的兴奋状态变化联系在一起,影响视觉皮层刺激表现和行为.
科学领域:
- 神经科学是一个神经科学.
- 认知科学 认知科学
- 心理学 心理学 心理学
背景情况:
- 神经反应表现出固有的试验到试验的变化,即使有稳定的刺激.
- 这种神经变化的根本原因,特别是在皮质表征中,仍然不完全理解.
- 兴奋状态的波动是一个潜在的,但尚未被充分探索的,影响神经信号忠实性的因素.
研究的目的:
- 调查兴奋状态的自发变化是否有助于神经群体活动的变化.
- 为了确定兴奋状态是否会调节人类视觉皮层中刺激表现的精度.
- 为了检查刺激调节的神经精度的行为后果.
主要方法:
- 使用功能磁共振成像 (fMRI) 和概率解码来评估视觉皮层刺激表现精度.
- 采用瞳孔测量技术持续监测和量化参与者的兴奋状态.
- 结合神经影像和瞳孔测量与行为任务 (定向判断和信心评分) 来链接神经,生理和行为测量.
主要成果:
- 在视觉皮层刺激表现的精度,主观信心和行为判断方面发现了显著的试验对试验的变化.
- 在瞳孔大小 (刺激前扩张和刺激呈现期间) 与神经表示的精度之间显示出强烈的相关性.
- 表明,在刺激呈现期间,瞳孔扩张的增加与更高的信心和更好的行为表现有关.
结论:
- 兴奋状态的自发波动显著调节人类视觉皮层中刺激表现的忠实性.
- 这些由兴奋驱动的神经表示精度的变化对感官知觉和行为产生了直接和可衡量的影响.
- 瞳孔测量作为一个有价值的,非侵入性指数,用于跟踪神经处理和感知的兴奋相关调制.
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