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Home » Archived » Flicker can be perceived during saccades at frequencies in excess of 1kHz

Flicker can be perceived during saccades at frequencies in excess of 1kHz

JE Roberts MSc and AJ Wilkins Dphil – University of Essex

Abstract

When driving at night, flickering automobile LED tail lights can appear as multiple 
images. The perception of a flickering source of light was therefore studied during rapid 
eye movements (saccades) of 20‐40 degrees amplitude in an otherwise dark room 
(<1lux). The temporal modulation appeared as a spatial pattern known as a “phantom 
array” during the saccade. The appearance of the pattern enabled the discrimination of 
flicker from steady light at frequencies that in 11 observers averaged 1.98kHz. At a 
frequency of 120Hz the intrasaccadic pattern was perceptible when the contrast of the 
flicker exceeded 10%. It is possible that intrasaccadic stimulation interferes with ocular 
motor control.  

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