I have often wondered the same. It must be torture for animals with a higher flicker fusion threshold. The Wikipedia page seems to suggest that your threshold i

I have often wondered the same. It must be torture for animals with a higher flicker fusion threshold. The Wikipedia page seems to suggest that your threshold is related to your metabolic rate. https://en.wikipedia.org/wiki/Flicker_fusion_threshold https://en.wikipedia.org/wiki/Flicker_fusion_threshold