Critical Flicker-Fusion Frequency

Thursday, February 19, 2015 - 15:25
Animal Culture
Economist
Bee

"…an objective measure which probably correlates with subjective experience does exist. It is called the critical flicker-fusion frequency, or CFF, and it is the lowest frequency at which a flickering light appears to be a constant source of illumination. … For people, the average CFF is 60 hertz… Dogs have a CFF of 80Hz… Flies, which have a CFF of 250Hz, are notoriously difficult to swat. A rolled up newspaper that seems to a human to be moving rapidly appears to them to be travelling through treacle."

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