The maximal fusion frequency for rod-mediated vision reaches a plateau at about 15 Hz, whereas cones reach a plateau, observable only at very high illumination intensities, of about 60 Hz
2.
Research at Haskins Laboratories in the 1960s showed that speech allows humans to achieve a vocal communication rate that exceeds the fusion frequency of the auditory system by fusing sounds together into syllables and words.
3.
Try searching the www or use Google Scholar with keywords like " flicker fusion frequency " or " temporal contrast sensitivity function . "-- Wjbeaty 02 : 37, 17 January 2007 ( UTC)
4.
For both rod-and cone-mediated vision, the fusion frequency increases as a function of illumination intensity, until it reaches a plateau corresponding to the maximal time resolution for each type of vision.
5.
In addition to increasing with average illumination intensity, the fusion frequency also increases with the extent of modulation ( the maximal relative decrease in light intensity presented ); for each frequency and average illumination, there is a characteristic modulation threshold, below which the flicker cannot be detected, and for each modulation depth and average illumination, there is a characteristic frequency threshold.
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