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灵长类的视网膜交易单光子检测用于高保真度对比编码

Markku Kilpeläinen^1,2, Johan Westö³, Jussi Tiihonen^2,3

¹Department of Psychology and Logopedics, University of Helsinki, Helsinki, Finland.

Nature communications

|May 27, 2024

概括

在其敏感度极限的人类视觉依赖于ON视网膜通路,而不是OFF通路. 这解释了为什么我们可以检测到光强度的差异,但不能在黑暗中检测到单个光子.

科学领域:

神经科学是一个神经科学.
视觉科学视觉科学视觉科学
视网膜生理学视网膜生理学

背景情况:

视网膜质细胞活动与人类视觉感知之间的确切关系尚不清楚.
在敏感度的极限理解视觉感知对于理解视觉处理至关重要.
截然不同的视网膜通路,如ON和OFF的阳细胞,在感知中的作用尚未完全阐明.

研究的目的:

调查视网膜尖峰输出,特别是来自ON和OFF遮阳细胞的输出,如何与视觉值的人类视觉感知有关.
为了确定哪个视网膜通路在最低光线水平下对视觉检测至关重要.

主要方法:

将人类的心理物理感知与灵长类视网膜质细胞 (RGC) 峰值输出的电生理记录相关联.
利用精确控制的刺激条件,将感知任务与RGC反应相匹配.
分析了ON和OFF巨细胞通路对视觉检测的贡献.

主要成果:

人类视力在其最终的灵敏度极限上取决于ON视网膜通路的尖端输出.
在这个灵敏度极限时,OFF视网膜通路不会对视觉感知做出贡献.
在ON路径内的非线性信号处理防止在黑暗中检测单光子.

结论:

在光检测的门上,ON视网膜通路对于人类视觉感知至关重要.
在ON路径中观察到的非线性允许区分光强度差异,尽管限制了单个光子的检测.
这些发现提供了对视觉神经基础的关键见解,视觉在最敏感的范围内.

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