Critical Flicker Frequency: A New Look at an Old Test

  • Randall S. Brenton
  • H. Stanley Thompson
  • Charles Maxner


If a light is repeatedly turned on and off it is seen to flicker, and if it flickers at increasing frequencies, it finally will appear to fuse into a continuous light. At higher frequencies, a subject will perceive the light to be fused as a steady light even though it is still flickering. The threshold at which this illusion can be seen is called critical flicker frequency. This threshold may also be found by decreasing the frequency until the light appears to flicker. The average of the ascending and descending values can be used to approximate the threshold of flicker perception. In the visual system critical flicker frequency, determined in this way, is a test of temporal resolution that is dependent on a subject’s conscious determination of threshold.


Optic Neuritis Optic Neuropathy Potential Latency Critical Flicker Fusion Critical Flicker Frequency 
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Copyright information

© Springer-Verlag New York Inc. 1989

Authors and Affiliations

  • Randall S. Brenton
  • H. Stanley Thompson
  • Charles Maxner

There are no affiliations available

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