Fernandez-Alonso Maydel, Innes Will, Read Jenny C A
Biosciences Institute, Newcastle University, Newcastle Upon Tyne NE2 4HH, UK.
Translational Sensory and Circadian Neuroscience, Max Planck Institute for Biological Cybernetics, 72076 Tübingen, Germany.
Vision (Basel). 2023 Mar 20;7(1):26. doi: 10.3390/vision7010026.
The relationship between luminous intensity and the maximum frequency of flicker that can be detected defines the limits of the temporal-resolving ability of the human visual system, and characterizing it has important theoretical and practical applications; particularly for determining the optimal refresh rate for visual displays that would avoid the visibility of flicker and other temporal artifacts. Previous research has shown that this relationship is best described by the Ferry-Porter law, which states that critical flicker fusion (CFF) increases as a linear function of log retinal illuminance. The existing experimental data showed that this law holds for a wide range of stimuli and up to 10,000 Trolands; however, beyond this, it was not clear if the CFF continued to increase linearly or if the function saturated. Our aim was to extend the experimental data available to higher light intensities than previously reported in the literature. For this, we measured the peripheral CFF at a range of illuminances over six orders of magnitude. Our results showed that for up to 10 Trolands, the data conformed to the Ferry-Porter law with a similar slope, as previously established for this eccentricity; however, at higher intensities, the CFF function flattens and saturates at ~90 Hz for a target size of 5.7 degrees, and at ~100 Hz for a target of 10 degrees of angular size. These experimental results could prove valuable for the design of brighter visual displays and illumination sources that are temporally modulated.
发光强度与可检测到的最大闪烁频率之间的关系定义了人类视觉系统时间分辨能力的极限，对其进行特征化具有重要的理论和实际应用；特别是在确定视觉显示器的最佳刷新率以避免闪烁和其他时间伪像的可见性方面。先前的研究表明，这种关系最好用费里 - 波特定律来描述，该定律指出临界闪烁融合频率（CFF）作为视网膜照度对数的线性函数而增加。现有的实验数据表明，该定律适用于广泛的刺激范围，直至10,000特罗兰；然而，除此之外，尚不清楚CFF是否继续线性增加或该函数是否饱和。我们的目标是将可用的实验数据扩展到比文献中先前报道的更高的光强度。为此，我们在六个数量级的一系列照度下测量了周边CFF。我们的结果表明，对于高达10特罗兰的情况，数据符合费里 - 波特定律，斜率与先前针对该偏心率确定的斜率相似；然而，在更高强度下，对于5.7度的目标尺寸，CFF函数在约90Hz时趋于平缓并饱和，对于10度角尺寸的目标，在约100Hz时趋于平缓并饱和。这些实验结果对于设计经过时间调制的更亮视觉显示器和照明源可能具有重要价值。
