早期视觉皮层中的工作记忆信号存在于弱和强图像器中
Simon Weber1,2,3, Thomas Christophel1,4, Kai Görgen1,3
1Bernstein Center for Computational Neuroscience Berlin and Berlin Center for Advanced Neuroimaging, Charité - Universitätsmedizin Berlin, corporate member of the Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany.
Human brain mapping
|February 24, 2024
概括
工作记忆依赖于早期视觉皮层信号,即使没有生动的视觉图像. 大脑活动重建对强弱成像器同样准确,挑战了以前的假设.
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.
- 视觉感知 视觉感知 视觉感知
背景情况:
- 视觉工作记忆和图像被认为涉及早期视觉皮层.
- 一个假设表明,这些视觉皮层信号反映了结合的记忆和图像代码.
- 这意味着图像生动度的减少应该与较弱的记忆信号相关.
研究的目的:
- 调查早期视觉皮层工作记忆信号是否在强弱视觉图像之间有所不同.
- 测试预测,较弱的图像导致视觉皮层中较弱的记忆表示.
主要方法:
- 参与者被分为强烈或弱弱的视觉成像者.
- 当参与者在短暂的延迟时间内执行视觉记忆任务时,收集了fMRI数据.
- 机器学习被用来从早期视觉皮层活动中重建记住的视觉刺激.
主要成果:
- 在这两组中,从早期视觉皮层活动中成功重建了记住的视觉刺激.
- 重建质量对于强弱成像器同样准确,与最初的预测相反.
- 视觉皮层中的可解码信息与整个图像谱的行为精度相关.
结论:
- 在早期视觉皮层中,工作记忆的表现存在,不管现象性的视觉图像生动性如何.
- 这些视觉皮层信号可以支持行为表现,即使在图像严重受限的个体 (幻觉症) 中也是如此.
- 这些发现挑战了生动的图像对于早期视觉区域的视觉工作记忆编码至关重要.
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